chore: v2.8.39 — no one can take a colleague's display name

A member kept renaming themselves to a colleague's display name, plus
"(you)", so the CPU/RAM card and every owner list showed two of that person.
A display name is now refused (409 ENAMETAKEN) when, with marks, case,
spaces, punctuation, bracketed parts and look-alike Cyrillic/Greek letters
ignored, it equals another account's display name or username — in
Settings → Account and on the Users page alike. Keeping the name one already
has stays allowed, so an older clash does not block an admin's other edits.

CLAUDE.md

@@ -1,6 +1,6 @@
 # Claude Code Working Guide
 
-_Last synced: v2.8.34 (2026-10-29) — the Changes panel shows an HTML page only on Preview (also from Changes)._ A change that makes any statement in this file, `AGENTS.md`, or a README wrong — a moved path, a new or changed extension point, a retired rule — updates that file in the same change-set and bumps this marker. **Bump = replace the version/date and a ≤ 1-line summary; never append a changelog here** — details belong in the commit message and `docs/`, because this whole file is loaded into every session.
+_Last synced: v2.8.39 (2026-10-29) — a display name may not read as another account's (ENAMETAKEN)._ A change that makes any statement in this file, `AGENTS.md`, or a README wrong — a moved path, a new or changed extension point, a retired rule — updates that file in the same change-set and bumps this marker. **Bump = replace the version/date and a ≤ 1-line summary; never append a changelog here** — details belong in the commit message and `docs/`, because this whole file is loaded into every session.
 
 ## Project mission
 - Maintain a reliable local-first dashboard for Claude Code session monitoring.
@@ -65,7 +65,7 @@ A **workspace** — called a **lane** in the API, CLI, database and code, which
 - **A workspace's sessions are the ones it OWNS, never the ones that ran in its folder.** `sessions.lane_id` is stamped by `bindRunSession` (`server/routes/hooks.js`) for the session a dashboard pane holds — first writer wins, a nested `claude -p` excluded — and no route sets it. A Codex/Antigravity session (their hooks are opt-in, so a pane may never learn its session) is also stamped by `claimToolSessions` (`server/lib/dashboard-runs.js`, called by both pollers and once at start): the lane of the newest same-tool dashboard run in the session's folder that was live when the session started, never a Claude session. A new Claude pane is started with `--session-id <uuid>` (`spawnRun`), so its `dashboard_runs.session_id` is known before any hook and a hook that carries no `run_id` (a hook handler older than `AGENTHUB_RUN_ID` forwarding) is still stamped from that run (`laneForSession`). Every workspace session list reads `GET /api/sessions?lane=<id>` — which also counts a still-unstamped session one of the lane's `dashboard_runs` holds, because hooks reach only the lowest-port dashboard on a shared DB and that one may be an older build that never stamps — and shows nothing else (no "other sessions in this folder"). Do not go back to listing a workspace by `cwd`, and do not guess ownership for old history.
 - **A session's worktree is `claude --worktree`'s, resolved from the session row — and removing it never forces.** A Worktree start passes `--worktree=<server-made name>` (the `=` form: `-w [name]` eats the prompt otherwise) and Claude Code makes, populates and cleans up `<repo>/.claude/worktrees/<name>`; AgentHub only excludes `/.claude/worktrees/` at the repo root. A git route, a resume or a removal may work in a session's worktree only through `sessionWorktree` (`server/lib/session-worktree.js`: the session owned by the lane, its cwd not the lane's folder, registered by `git worktree list`) — `?session=` on the git routes answers `ENOWORKTREE` rather than falling back to the main folder. `POST /api/lanes/:id/session-worktree/remove` (same-origin, `confirm: true`, refused while a live pane holds the session) is the ONE dashboard path that deletes a worktree: `git worktree remove` with no `--force`, `git branch -d` never `-D`, a live-pid lock refused. Do not add a force, and do not let it touch a lane's own folder.
 - **Opening a session never resumes it — only SENDING a message to it does.** The sidebar and a workspace home ATTACH pane 0 to a session's live tmux pane (`/workspace?lane=<id>&run=<runId>`, `attachRequest` on `LaneConsolePane`) or, for an ended one, open it in its workspace like Claude Desktop (`/workspace?lane=<id>&session=<id>`, `client/src/components/lanes/SessionReplay.tsx`: its conversation read-only plus a prompt box; the console is only hidden, CSS). A resume re-reads the whole transcript into context, so it happens only on an explicit action: a message SENT from that replay (`resumeSessionId` + `prompt`, first free slot), the transcript page's **Resume**/**Fork** (`SessionResumeButton.tsx`, behind a warning), or the ticked sessions of the **Resume interrupted sessions?** dialog (`InterruptedSessionsPrompt.tsx`, `GET /api/run/interrupted` — runs whose pane died under them; opening it resumes nothing). The analysis page `/sessions/<id>` is reached from the session view's **Analyst** button (beside Files/Changes in the right panel). Do not add a path that resumes on a click. A resume is refused while a live pane holds the session (`409 ESESSIONLIVE` with that pane's `run_id`) — open that pane instead; a fork makes a new session and is allowed.
-- **A chat artifact runs in its own sandbox, never on the dashboard's origin.** The artifact panel (`client/src/components/run/ChatFilePreview.tsx`, `client/src/lib/artifactView.ts`) runs model-written HTML/Mermaid/React in an `<iframe srcdoc sandbox="allow-scripts …">` and an SVG in `sandbox=""` — never add `allow-same-origin` (the script would read the dashboard's cookies and call its API as the user), never render one with `dangerouslySetInnerHTML`, and keep its CDN libraries pinned to exact versions. An HTML FILE opened from the Changes panel, a Chat file preview or the File Explorer runs in the same sandbox (`client/src/components/HtmlFrame.tsx`); its relative CSS/scripts/images are fetched by the DASHBOARD through the existing download routes and inlined (`client/src/lib/htmlInline.ts`) — never add a route that serves a folder to the frame without the login cookie. Versions are rebuilt from Write/Edit inputs (kept up to 256 KB by `server/lib/transcript-message.js`); no copy is stored, and Save to Artifacts uses the Hub's own `pinFile`/upload routes.
+- **A chat artifact runs in its own sandbox, never on the dashboard's origin.** The artifact panel (`client/src/components/run/ChatFilePreview.tsx`, `client/src/lib/artifactView.ts`) runs model-written HTML/Mermaid/React in an `<iframe srcdoc sandbox="allow-scripts …">` and an SVG in `sandbox=""` — never add `allow-same-origin` (the script would read the dashboard's cookies and call its API as the user), never render one with `dangerouslySetInnerHTML`, and keep its CDN libraries pinned to exact versions. An HTML FILE opened from the Changes panel, a Chat file preview or the File Explorer runs in the same sandbox (`client/src/components/HtmlFrame.tsx`, shown in a modal — `HtmlViewerModal.tsx`, Chat's `FilePreview modal`); its relative CSS/scripts/images are fetched by the DASHBOARD through the existing download routes and inlined (`client/src/lib/htmlInline.ts`) — never add a route that serves a folder to the frame without the login cookie. Versions are rebuilt from Write/Edit inputs (kept up to 256 KB by `server/lib/transcript-message.js`); no copy is stored, and Save to Artifacts uses the Hub's own `pinFile`/upload routes.
 - **A `cwd` can back at most one lane per tool, not one lane overall.** Uniqueness is the composite `idx_lanes_cwd_tool` (`cwd`, `tool`), not `cwd` alone — Repo/Adopt mode (`POST /api/lanes/ensure`) lets the same directory carry a `claude` lane and a `codex` lane side by side, shown as two separate cards. `resolveLaneByCwd(cwd, tool)` takes an optional `tool` filter for exactly this; hook ingestion (`touchLaneFromHook`) pins it to the hook's own tool — `claude`, `codex` for a hook posted with `tool: "codex"`, or `antigravity` for one posted with `tool: "antigravity"` (the Codex and Antigravity hook rules above) — so a hook event never touches the other tool's lane sharing the path, and stage detection (`resolveLaneForWork` + `detect`) runs for `claude` only. Worktree mode is unaffected — it already allocates a unique directory per lane.
 
 See `docs/LANES.md` for full guide: stage reporting, custom templates, lane actions, and the five node states.

client/src/components/HtmlViewerModal.tsx

@@ -0,0 +1,109 @@
+/**
+ * @file HtmlViewerModal.tsx
+ * @description An HTML file shown as the page in a modal over the whole
+ * screen — the one viewer the File Explorer and the Changes panel's Preview
+ * open (the Chat's file preview opens its own panel as a modal instead, for
+ * its versions and Code tab). The page itself is `HtmlFrame`: the chat
+ * artifact's sandbox, its relative files read through the caller's guarded
+ * `fetchFile`. Keys and clicks stop at the modal, so a shortcut of the view
+ * underneath (the explorer's Delete) never fires from inside it.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { useRef, type ReactNode } from "react";
+import { createPortal } from "react-dom";
+import { useTranslation } from "react-i18next";
+import { Download, X } from "lucide-react";
+import { useDialog } from "../hooks/useDialog";
+import { HtmlFrame } from "./HtmlFrame";
+import type { FetchFile } from "../lib/htmlInline";
+
+export function HtmlViewerModal({
+  path,
+  html,
+  fetchFile,
+  onDownload,
+  onClose,
+  testId = "html-viewer",
+}: {
+  /** The file's path relative to the place `fetchFile` reads from; also its title. */
+  path: string;
+  /** The page's text; read through `fetchFile` when absent. */
+  html?: string;
+  fetchFile?: FetchFile | null;
+  onDownload?: () => void;
+  onClose: () => void;
+  testId?: string;
+}) {
+  const { t } = useTranslation(["lanes"]);
+  const panelRef = useRef<HTMLDivElement>(null);
+  useDialog(true, panelRef, onClose);
+  const name = path.slice(path.lastIndexOf("/") + 1);
+  return createPortal(
+    <div
+      className="fixed inset-0 z-[70] flex items-center justify-center bg-black/60 p-3"
+      onClick={(e) => {
+        e.stopPropagation();
+        onClose();
+      }}
+      onKeyDown={(e) => {
+        // Nothing reaches the view underneath — so Esc, which useDialog's
+        // document listener would never see, closes here.
+        e.stopPropagation();
+        if (e.key === "Escape") onClose();
+      }}
+      role="presentation"
+    >
+      <div
+        ref={panelRef}
+        role="dialog"
+        aria-modal="true"
+        aria-label={name}
+        data-testid={testId}
+        className="flex h-[92vh] w-[96vw] max-w-7xl flex-col overflow-hidden rounded-xl border border-border bg-surface-1 shadow-2xl shadow-black/50"
+        onClick={(e) => e.stopPropagation()}
+      >
+        <div className="flex items-center gap-2 border-b border-border px-3 py-2">
+          <span className="min-w-0 flex-1 truncate font-mono text-[13px] text-fg-primary">
+            {path}
+          </span>
+          {onDownload && (
+            <HeadButton label={t("fx.download")} onClick={onDownload}>
+              <Download className="h-4 w-4" />
+            </HeadButton>
+          )}
+          <HeadButton label={t("fx.close")} onClick={onClose}>
+            <X className="h-4 w-4" />
+          </HeadButton>
+        </div>
+        <HtmlFrame path={path} html={html} fetchFile={fetchFile} title={name} />
+      </div>
+    </div>,
+    document.body
+  );
+}
+
+function HeadButton({
+  label,
+  onClick,
+  children,
+}: {
+  label: string;
+  onClick: () => void;
+  children: ReactNode;
+}) {
+  return (
+    <button
+      type="button"
+      aria-label={label}
+      title={label}
+      onClick={(e) => {
+        e.stopPropagation();
+        onClick();
+      }}
+      className="rounded-md p-1.5 text-fg-secondary transition-colors hover:bg-surface-2 hover:text-fg-primary"
+    >
+      {children}
+    </button>
+  );
+}

client/src/components/health/HostHealth.tsx

@@ -683,7 +683,12 @@ export function HostSections({ host, heap }: { host: HostState; heap?: HeapInfo
                     aria-expanded={isOpen}
                     className="flex w-full items-center gap-2 text-left disabled:cursor-default"
                   >
-                    <UserAvatar name={name} className="h-6 w-6 text-[10px]" />
+                    <UserAvatar
+                      name={name}
+                      userId={g.userId}
+                      avatarAt={g.avatarAt}
+                      className="h-6 w-6 text-[10px]"
+                    />
                     <span className="min-w-0 flex-1 truncate text-xs text-fg-secondary">
                       {name}
                     </span>

client/src/components/health/__tests__/HostHealth.test.tsx

@@ -69,6 +69,7 @@ const stats: HostStats = {
 const api = vi.hoisted(() => ({
   host: { stats: vi.fn(), history: vi.fn() },
   me: { avatarUrl: () => null },
+  users: { avatarUrl: () => null },
 }));
 vi.mock("../../../lib/api", async (importOriginal) => {
   const actual = await importOriginal<Record<string, unknown>>();

client/src/components/lanes/FileExplorer.tsx

@@ -91,7 +91,8 @@ import {
 } from "../../lib/api";
 import type { Lane } from "../../lib/types";
 import { useDialog } from "../../hooks/useDialog";
-import { HtmlFrame, fetchVia } from "../HtmlFrame";
+import { fetchVia } from "../HtmlFrame";
+import { HtmlViewerModal } from "../HtmlViewerModal";
 import { toast } from "../../lib/toast";
 import { confirmDialog } from "../../lib/confirm";
 import { formatBytes } from "../../lib/format";
@@ -1935,10 +1936,8 @@ export function FileExplorer({
   );
 }
 
-/** An HTML file shown as the page, over the explorer: its relative CSS,
- *  scripts and images read through the same download route (`HtmlFrame`).
- *  Keys and clicks stop here — through the portal they would otherwise reach
- *  the explorer's own shortcuts (Delete would trash the selection). */
+/** An HTML file as the page, in the shared modal viewer (`HtmlViewerModal`):
+ *  its relative CSS, scripts and images read through the same download route. */
 function HtmlViewer({
   entry,
   place,
@@ -1950,49 +1949,20 @@ function HtmlViewer({
   onDownload: () => void;
   onClose: () => void;
 }) {
-  const { t } = useTranslation(["lanes"]);
-  const panelRef = useRef<HTMLDivElement>(null);
-  useDialog(true, panelRef, onClose);
   const placeKey = JSON.stringify(place);
   const fetchFile = useMemo(
     () => fetchVia((p) => api.files.downloadUrl(place, p)),
     // eslint-disable-next-line react-hooks/exhaustive-deps
     [placeKey]
   );
-  return createPortal(
-    <div
-      className="fixed inset-0 z-[70] flex items-center justify-center bg-black/60 p-3"
-      onClick={(e) => {
-        e.stopPropagation();
-        onClose();
-      }}
-      onKeyDown={(e) => e.stopPropagation()}
-      role="presentation"
-    >
-      <div
-        ref={panelRef}
-        role="dialog"
-        aria-modal="true"
-        aria-label={entry.name}
-        data-testid="fx-html-viewer"
-        className="flex h-[92vh] w-[96vw] max-w-7xl flex-col overflow-hidden rounded-xl border border-border bg-surface-1 shadow-2xl shadow-black/50"
-        onClick={(e) => e.stopPropagation()}
-      >
-        <div className="flex items-center gap-2 border-b border-border px-3 py-2">
-          <span className="min-w-0 flex-1 truncate font-mono text-[13px] text-fg-primary">
-            {entry.path}
-          </span>
-          <HeadButton label={t("fx.download")} onClick={onDownload}>
-            <Download className="h-4 w-4" />
-          </HeadButton>
-          <HeadButton label={t("fx.close")} onClick={onClose}>
-            <X className="h-4 w-4" />
-          </HeadButton>
-        </div>
-        <HtmlFrame path={entry.path} fetchFile={fetchFile} title={entry.name} />
-      </div>
-    </div>,
-    document.body
+  return (
+    <HtmlViewerModal
+      path={entry.path}
+      fetchFile={fetchFile}
+      onDownload={onDownload}
+      onClose={onClose}
+      testId="fx-html-viewer"
+    />
   );
 }
 

client/src/components/lanes/LaneChangesPanel.tsx

@@ -14,9 +14,9 @@
  *              is unsaved): Changes folds the unchanged lines away, Whole file
  *              shows them; any other file opens on its read-only diff; a
  *              whole markdown file can also be read rendered (Preview), an HTML
- *              file shown as the page on Preview, from Changes too
- *              (`HtmlFrame`, its relative CSS, scripts and images read like
- *              downloads), and an
+ *              file's Preview beside Whole file opens the page in a modal
+ *              (`HtmlViewerModal`, its relative CSS, scripts and images read
+ *              like downloads), and an
  *              image file is shown as the picture (`GET …/git/raw`)
  *   history  — recent commits; opening one shows that commit's diff
  *   browse   — quick-open by path, or the repo's tracked file tree (the
@@ -139,7 +139,8 @@ import { LaneConflictView } from "./LaneConflictView";
 import { FileExplorer } from "./FileExplorer";
 import { ContextMenu, MenuItem, MenuSeparator, useContextMenu } from "../ContextMenu";
 import { MarkdownPreview, isMarkdown } from "../MarkdownPreview";
-import { HtmlFrame, fetchVia } from "../HtmlFrame";
+import { fetchVia } from "../HtmlFrame";
+import { HtmlViewerModal } from "../HtmlViewerModal";
 import { LaneGitHeader, useLaneGitFacts } from "./LaneGitHeader";
 import { changeTree, treeFiles, type ChangeTreeDir } from "../../lib/changeTree";
 import { dragProjectPath } from "../../lib/promptAttach";
@@ -198,7 +199,7 @@ function Delta({
   );
 }
 
-/** An HTML page, which the viewer can show rendered (`HtmlFrame`). */
+/** An HTML page, which Preview opens as the page (`HtmlViewerModal`). */
 const isHtml = (p: string | null | undefined) => !!p && /\.html?$/i.test(p);
 
 /** What the viewer shows as a picture (`readImageAt`'s list on the server). */
@@ -890,11 +891,13 @@ export function LaneChangesPanel({
   const [layout, setLayout] = useState<DiffLayout>(wide ? "split" : "unified");
   useEffect(() => setLayout(wide ? "split" : "unified"), [wide]);
   const [whole, setWhole] = useState(false);
-  // A whole markdown or HTML file shown rendered instead of as source; per
-  // file, markdown opening as Settings → Appearance says
-  // (`lib/markdownView.ts`), an HTML page only once Preview is clicked.
+  // A whole markdown file shown rendered instead of as source; per file,
+  // opening as Settings → Appearance says (`lib/markdownView.ts`).
   const [mdPreview, setMdPreview] = useState(readMarkdownPreview);
-  useEffect(() => setMdPreview(!isHtml(openFile) && readMarkdownPreview()), [openFile]);
+  useEffect(() => setMdPreview(readMarkdownPreview()), [openFile]);
+  // An HTML file's page, open in the modal viewer (Preview beside Whole file).
+  const [htmlOpen, setHtmlOpen] = useState(false);
+  useEffect(() => setHtmlOpen(false), [openFile, mode]);
   const [data, setData] = useState<LaneChanges | null>(null);
   // A folder that is not a repo (an empty new workspace, a parent of clones)
   // has no changes, review or history — only its files, which Files reads
@@ -2059,8 +2062,8 @@ export function LaneChangesPanel({
     });
 
   const dirty = draft !== null && draft !== text?.lines.join("\n");
-  // Rendered only where the toggle is offered: a whole markdown or HTML file.
-  const mdShown = mdPreview && whole && (isMarkdown(openFile) || isHtml(openFile));
+  // Rendered only where the toggle is offered: a whole markdown file.
+  const mdShown = mdPreview && whole && isMarkdown(openFile);
   // An HTML page's relative CSS/scripts/images, read like a download — only
   // from the working tree: a commit's page would get today's files.
   const htmlFetch = useMemo(
@@ -2563,9 +2566,6 @@ export function LaneChangesPanel({
                       aria-pressed={whole === w}
                       onClick={() => {
                         if (whole === w) return;
-                        // Changes and Whole file show an HTML page's source;
-                        // only Preview runs it.
-                        if (isHtml(openFile)) setMdPreview(false);
                         // Both views of a working file are the same editor: the
                         // draft goes along, unsaved or not.
                         if (editable && draft !== null) return setWhole(w);
@@ -2588,6 +2588,31 @@ export function LaneChangesPanel({
                   ))}
                 </div>
               )}
+              {/* An HTML file opens as the page in a modal over the screen;
+                  a commit's page once its text is read (Whole file). */}
+              {mode === "file" && isHtml(openFile) && (
+                <button
+                  type="button"
+                  data-testid="lane-file-preview"
+                  disabled={dirty || (range === "commit" && !text)}
+                  onClick={() => setHtmlOpen(true)}
+                  className="flex items-center gap-1 rounded border border-border bg-surface-2 px-2 py-1 text-[11px] text-fg-secondary hover:text-fg-primary disabled:cursor-not-allowed disabled:opacity-40"
+                >
+                  <Eye className="h-3 w-3" />
+                  {t("changes.preview")}
+                </button>
+              )}
+              {htmlOpen && openFile && (
+                <HtmlViewerModal
+                  path={openFile}
+                  // A commit's page is its text at that commit (no sibling
+                  // files); a working one is read whole from the disk.
+                  html={range === "commit" ? text?.lines.join("\n") : undefined}
+                  fetchFile={htmlFetch}
+                  onDownload={!local && range !== "commit" ? () => download(openFile) : undefined}
+                  onClose={() => setHtmlOpen(false)}
+                />
+              )}
             </div>
           )}
         </div>
@@ -2997,21 +3022,17 @@ export function LaneChangesPanel({
                       {t("changes.annotate")}
                     </button>
                   )}
-                  {/* Offered on Changes too: from there it opens the rendered whole file. */}
-                  {(!whole || text) && !dirty && (isMarkdown(openFile) || isHtml(openFile)) && (
+                  {/* An HTML file's Preview sits beside Whole file instead. */}
+                  {whole && text && !dirty && isMarkdown(openFile) && (
                     <button
                       type="button"
                       data-testid="lane-file-preview"
-                      aria-pressed={whole && mdPreview}
-                      onClick={() => {
-                        if (whole) return setMdPreview((v) => !v);
-                        setMdPreview(true);
-                        setWhole(true);
-                      }}
+                      aria-pressed={mdPreview}
+                      onClick={() => setMdPreview((v) => !v)}
                       className="flex shrink-0 items-center gap-1 self-center rounded border border-border-light px-1.5 py-0.5 text-[11px] text-fg-secondary hover:bg-surface-2 hover:text-fg-primary"
                     >
-                      {whole && mdPreview ? <Code2 className="h-3 w-3" /> : <Eye className="h-3 w-3" />}
-                      {whole && mdPreview ? t("changes.raw") : t("changes.preview")}
+                      {mdPreview ? <Code2 className="h-3 w-3" /> : <Eye className="h-3 w-3" />}
+                      {mdPreview ? t("changes.raw") : t("changes.preview")}
                     </button>
                   )}
                   {!local && range !== "commit" && openFile && (
@@ -3146,17 +3167,7 @@ export function LaneChangesPanel({
                     </Suspense>
                   )
                 ) : whole ? (
-                  text && mdShown && isHtml(openFile) ? (
-                    <HtmlFrame
-                      key={openFile}
-                      path={text.path}
-                      // A cut-off page is read whole through the download.
-                      html={text.truncated && htmlFetch ? undefined : text.lines.join("\n")}
-                      fetchFile={htmlFetch}
-                      title={text.path}
-                      className="rounded border border-border-light"
-                    />
-                  ) : text && mdShown ? (
+                  text && mdShown ? (
                     <div className="min-h-0 flex-1 overflow-auto rounded border border-border-light bg-surface-0 p-4">
                       <MarkdownPreview text={text.lines.join("\n")} />
                     </div>

client/src/components/lanes/__tests__/LaneChangesPanel.test.tsx

@@ -544,7 +544,7 @@ describe("LaneChangesPanel", () => {
     expect(screen.queryByTestId("lane-file-editor")).toBeNull();
   });
 
-  it("opens a whole HTML file as its source, the page after Preview, the source after Raw", async () => {
+  it("opens a whole HTML file as its source, the page in a modal after Preview", async () => {
     vi.mocked(api.lanes.gitTree).mockResolvedValue({
       available: true,
       path: "",
@@ -560,21 +560,31 @@ describe("LaneChangesPanel", () => {
       lines: ["<p>deck</p>"],
       sha: "c".repeat(40),
     });
-    const user = userEvent.setup();
-    render(<LaneChangesPanel laneId={7} full />);
-    const sidebar = await screen.findByTestId("lane-changes-sidebar");
-    await user.click(await within(sidebar).findByText("deck.html"));
-    expect(await screen.findByTestId("lane-file-editor")).toHaveValue("<p>deck</p>");
-    expect(screen.queryByTestId("html-frame")).toBeNull();
-    await user.click(screen.getByTestId("lane-file-preview"));
-    const frame = await screen.findByTestId("html-frame");
-    expect(frame.getAttribute("srcdoc")).toContain("<p>deck</p>");
-    await user.click(screen.getByTestId("lane-file-preview"));
-    expect(await screen.findByTestId("lane-file-editor")).toHaveValue("<p>deck</p>");
-    expect(screen.queryByTestId("html-frame")).toBeNull();
+    const fetchSpy = vi
+      .spyOn(globalThis, "fetch")
+      .mockResolvedValue(new Response("<p>deck</p>", { status: 200 }));
+    try {
+      const user = userEvent.setup();
+      render(<LaneChangesPanel laneId={7} full />);
+      const sidebar = await screen.findByTestId("lane-changes-sidebar");
+      await user.click(await within(sidebar).findByText("deck.html"));
+      expect(await screen.findByTestId("lane-file-editor")).toHaveValue("<p>deck</p>");
+      expect(screen.queryByTestId("html-frame")).toBeNull();
+      await user.click(screen.getByTestId("lane-file-preview"));
+      const modal = await screen.findByTestId("html-viewer");
+      const frame = await within(modal).findByTestId("html-frame");
+      expect(frame.getAttribute("srcdoc")).toContain("<p>deck</p>");
+      expect(frame.getAttribute("sandbox")).not.toContain("allow-same-origin");
+      await user.keyboard("{Escape}");
+      await waitFor(() => expect(screen.queryByTestId("html-viewer")).toBeNull());
+      // The source stayed where it was, under the modal.
+      expect(screen.getByTestId("lane-file-editor")).toHaveValue("<p>deck</p>");
+    } finally {
+      fetchSpy.mockRestore();
+    }
   });
 
-  it("opens a changed HTML file on its Changes, the page only after Preview", async () => {
+  it("offers Preview on a changed HTML file's Changes, opening the page in a modal", async () => {
     vi.mocked(api.lanes.changes).mockResolvedValue(
       changes({
         files: [
@@ -582,28 +592,21 @@ describe("LaneChangesPanel", () => {
         ],
       })
     );
-    vi.mocked(api.lanes.gitFile).mockResolvedValue({
-      available: true,
-      path: "deck.html",
-      rev: "work",
-      binary: false,
-      truncated: false,
-      lines: ["<p>deck</p>"],
-      sha: "c".repeat(40),
-    });
-    const user = userEvent.setup();
-    render(<LaneChangesPanel laneId={7} />);
-    await user.click(await screen.findByTitle("deck.html"));
-    await screen.findByRole("button", { name: "Changes", pressed: true });
-    expect(screen.queryByTestId("html-frame")).toBeNull();
-    await user.click(await screen.findByTestId("lane-file-preview"));
-    const frame = await screen.findByTestId("html-frame");
-    expect(frame.getAttribute("srcdoc")).toContain("<p>deck</p>");
-    expect(frame.getAttribute("sandbox")).not.toContain("allow-same-origin");
-    // Back to Changes, then Whole file: the source again, not the page.
-    await user.click(screen.getByRole("button", { name: "Changes", pressed: false }));
-    await user.click(screen.getByRole("button", { name: "Whole file", pressed: false }));
-    await waitFor(() => expect(screen.queryByTestId("html-frame")).toBeNull());
+    const fetchSpy = vi
+      .spyOn(globalThis, "fetch")
+      .mockResolvedValue(new Response("<p>deck</p>", { status: 200 }));
+    try {
+      const user = userEvent.setup();
+      render(<LaneChangesPanel laneId={7} />);
+      await user.click(await screen.findByTitle("deck.html"));
+      await screen.findByRole("button", { name: "Changes", pressed: true });
+      await user.click(await screen.findByTestId("lane-file-preview"));
+      const modal = await screen.findByTestId("html-viewer");
+      expect(await within(modal).findByTestId("html-frame")).toBeInTheDocument();
+      expect(screen.getByRole("button", { name: "Changes", pressed: true })).toBeInTheDocument();
+    } finally {
+      fetchSpy.mockRestore();
+    }
   });
 
   it("shows an image file as the picture, with no edit control", async () => {

client/src/components/run/ChatFilePreview.tsx

@@ -12,6 +12,8 @@
  * text file it read, wrote or named (a generated report) anywhere else through
  * `GET /api/sessions/:id/file`.
  * Anything else (or a file those routes refuse) shows its path only. A Windows path's `\` counts as `/` throughout.
+ * `FilePreview` with `modal` (an HTML page, from PaneChat) is the same view in
+ * a modal over the whole screen.
  * `SkillListModal` is the same dialog over the session's skills, each one's
  * SKILL.md found by name (`plugin:name` from the plugin list, else the user's
  * or the project's); a built-in skill has no file and shows by name only.
@@ -357,6 +359,7 @@ export function FilePreview({
   onClose,
   className = "",
   messages,
+  modal = false,
 }: {
   path: string;
   scope: PreviewScope;
@@ -364,12 +367,16 @@ export function FilePreview({
   className?: string;
   /** The conversation, for the versions its Write/Edit calls left. */
   messages?: TranscriptMessage[];
+  /** A modal over the whole screen (backdrop, Esc closes) instead of a panel. */
+  modal?: boolean;
 }) {
   const { t } = useTranslation("run");
   const kind = artifactKind(path);
   const loaded = useContent(path, scope);
   const [view, setView] = useState<View>(() => defaultView(path));
   const [full, setFull] = useState(false);
+  const modalRef = useRef<HTMLDivElement>(null);
+  useDialog(modal, modalRef, onClose);
   const [sharing, setSharing] = useState(false);
   const versions = useMemo(
     () => (messages ? artifactVersions(messages, path) : []),
@@ -424,7 +431,9 @@ export function FilePreview({
     <section
       data-testid="chat-file-preview"
       className={
-        full
+        modal
+          ? "flex h-[92vh] w-[96vw] max-w-7xl min-h-0 min-w-0 flex-col overflow-hidden rounded-xl border border-border bg-surface-1 shadow-2xl shadow-black/50"
+          : full
           ? "fixed inset-4 z-[200] flex min-h-0 min-w-0 flex-col overflow-hidden rounded-xl border border-border bg-surface-1 shadow-2xl"
           : `flex min-h-0 min-w-0 flex-col overflow-hidden bg-surface-1 ${className}`
       }
@@ -522,16 +531,18 @@ export function FilePreview({
               <Share2 className="h-3.5 w-3.5" />
             )}
           </button>
-          <button
-            type="button"
-            data-testid="artifact-expand"
-            onClick={() => setFull((f) => !f)}
-            title={t(full ? "chat.artifact.collapse" : "chat.artifact.expand")}
-            aria-label={t(full ? "chat.artifact.collapse" : "chat.artifact.expand")}
-            className={iconBtn}
-          >
-            {full ? <Minimize2 className="h-3.5 w-3.5" /> : <Maximize2 className="h-3.5 w-3.5" />}
-          </button>
+          {!modal && (
+            <button
+              type="button"
+              data-testid="artifact-expand"
+              onClick={() => setFull((f) => !f)}
+              title={t(full ? "chat.artifact.collapse" : "chat.artifact.expand")}
+              aria-label={t(full ? "chat.artifact.collapse" : "chat.artifact.expand")}
+              className={iconBtn}
+            >
+              {full ? <Minimize2 className="h-3.5 w-3.5" /> : <Maximize2 className="h-3.5 w-3.5" />}
+            </button>
+          )}
           <button
             type="button"
             onClick={onClose}
@@ -546,6 +557,32 @@ export function FilePreview({
       <Body path={path} content={content} view={view} scope={scope} />
     </section>
   );
+  if (modal) {
+    return createPortal(
+      <div
+        className="fixed inset-0 z-[70] flex items-center justify-center bg-black/60 p-3"
+        onClick={onClose}
+        onKeyDown={(e) => {
+          // Nothing reaches the view underneath — so Esc, which useDialog's
+          // document listener would never see, closes here.
+          e.stopPropagation();
+          if (e.key === "Escape") onClose();
+        }}
+        role="presentation"
+      >
+        <div
+          ref={modalRef}
+          role="dialog"
+          aria-modal="true"
+          aria-label={displayName(path)}
+          onClick={(e) => e.stopPropagation()}
+        >
+          {panel}
+        </div>
+      </div>,
+      document.body
+    );
+  }
   // Full screen: over the whole page, where a pane's edges cannot clip it.
   return full ? createPortal(panel, document.body) : panel;
 }

client/src/components/run/PaneChat.tsx

@@ -35,7 +35,9 @@
  * of files or the used skills a list with a preview (`FileListModal`,
  * `SkillListModal`). Anything there drags into the prompt box. A file in a turn's
  * "Edited N files" card opens in the Workspace's Changes panel
- * (`openInChanges`) when it lies in the pane's folder. The unsent prompt and
+ * (`openInChanges`) when it lies in the pane's folder. An HTML file — a card,
+ * an Outputs row, a path in a reply — opens instead as the page, the same
+ * preview in a modal over the whole screen. The unsent prompt and
  * its attachments are kept per session (`lib/chatDraft.ts`), so a reload
  * leaves them as typed; switching to the terminal pastes them into its input
  * box and back brings that box's text here (`ChatToggle`). A send scrolls the
@@ -582,6 +584,12 @@ export const PaneChat = memo(function PaneChat({
     setPreview(null);
   };
   const [preview, setPreview] = useState<string | null>(null);
+  // An HTML file shown as the page, in a modal over the screen.
+  const [htmlView, setHtmlView] = useState<string | null>(null);
+  const show = useCallback(
+    (path: string) => (/\.html?$/i.test(path) ? setHtmlView(path) : setPreview(path)),
+    []
+  );
   // The side panel's width as a fraction of the pane: the dragged one, else
   // a default per content (a preview wants more room than the panel).
   const [dragged, setDragged] = useState(storedSide);
@@ -757,20 +765,21 @@ export const PaneChat = memo(function PaneChat({
   // not the workspace's Changes panel a plain file link goes to.
   const openArtifact = useCallback(
     (named: string) => {
-      setPreview(resolveIn(cwd, named));
+      show(resolveIn(cwd, named));
     },
-    [cwd]
+    [cwd, show]
   );
   const openFile = useCallback(
     (named: string) => {
       // A relative path in a reply (`server/lib/x.js`) is relative to this pane's folder.
       const path = resolveIn(cwd, named);
+      if (/\.html?$/i.test(path)) return show(path);
       // The workspace's Changes panel when the file is in its folder;
       // else this view's own preview.
       if (laneId !== null && openInChanges(laneId, cwd, path)) return;
       setPreview(path);
     },
-    [laneId, cwd]
+    [laneId, cwd, show]
   );
 
   // Before the session starts the CLI may be asking in the terminal (trust
@@ -984,7 +993,7 @@ export const PaneChat = memo(function PaneChat({
           <ChatOutline
             outline={activity}
             onClose={() => openOutline(false)}
-            onOpenFile={setPreview}
+            onOpenFile={show}
             onOpenList={setList}
           />
         )
@@ -1006,6 +1015,15 @@ export const PaneChat = memo(function PaneChat({
           />
         </div>
       )}
+      {htmlView && (
+        <FilePreview
+          path={htmlView}
+          scope={scope}
+          messages={convMessages}
+          onClose={() => setHtmlView(null)}
+          modal
+        />
+      )}
       {list === "skills" && (
         <SkillListModal
           title={t("chat.outline.skills")}

client/src/components/run/__tests__/ChatFilePreview.test.tsx

@@ -217,6 +217,17 @@ describe("the artifact view", () => {
     cleanup();
   });
 
+  it("shows a page as a modal over the screen, closed by Esc", async () => {
+    const onClose = vi.fn();
+    render(<FilePreview path="/w/page.html" scope={scope} onClose={onClose} modal />);
+    const dialog = await screen.findByRole("dialog", { name: "page.html" });
+    expect(dialog.parentElement?.parentElement).toBe(document.body);
+    expect(await screen.findByTestId("artifact-frame")).toBeInTheDocument();
+    expect(screen.queryByTestId("artifact-expand")).toBeNull();
+    fireEvent.keyDown(screen.getByTestId("artifact-tab-code"), { key: "Escape" });
+    expect(onClose).toHaveBeenCalled();
+  });
+
   it("steps back to an older version the conversation wrote", async () => {
     html(["<p>two</p>"]);
     const tool = (id: string, input: Record<string, unknown>, name = "Write") => ({

client/src/components/users/MemberPicker.tsx

@@ -13,6 +13,7 @@ import { useTranslation } from "react-i18next";
 import { Search } from "lucide-react";
 import type { AuthUser, ServerUserUsage } from "../../lib/api";
 import { Checkbox } from "../Checkbox";
+import { UserAvatar } from "./UserAvatar";
 
 export const ROLES: AuthUser["role"][] = ["admin", "developer", "analyst"];
 /** A role, every user, or the users in no pool group. */
@@ -168,7 +169,14 @@ export function MemberPicker({
               checked={chosen.has(u.id)}
               onChange={(on) => setMany([u.id], on)}
               label={
-                <span>
+                <span className="inline-flex items-center gap-1.5">
+                  <UserAvatar
+                    name={u.displayName || u.username}
+                    userId={u.id}
+                    avatarAt={u.avatarAt}
+                    letters={1}
+                    className="h-5 w-5 text-[10px]"
+                  />
                   {u.username}
                   {u.disabled && <span className="ml-1 text-fg-muted">({t("disabled")})</span>}
                   {note?.(u)}

client/src/components/users/PoolGroups.tsx

@@ -36,6 +36,7 @@ import { toast } from "../../lib/toast";
 import { ConfirmModal } from "../ConfirmModal";
 import { AiToolIcon } from "../AiToolIcon";
 import { MemberPicker } from "./MemberPicker";
+import { UserAvatar } from "./UserAvatar";
 
 /** Pool tools with their labels, in display order. */
 export const POOL_TOOL_LABELS: { id: PoolTool; label: string }[] = [
@@ -363,12 +364,13 @@ export function PoolGroups({
         } ${isDragged(drag) ? "opacity-40" : ""}`}
         data-testid="pool-member"
       >
-        <span
-          className="flex h-4 w-4 items-center justify-center rounded-full bg-accent/15 text-[9px] font-semibold uppercase text-accent"
-          aria-hidden
-        >
-          {name.charAt(0)}
-        </span>
+        <UserAvatar
+          name={name}
+          userId={id}
+          avatarAt={u?.avatarAt}
+          letters={1}
+          className="h-4 w-4 text-[9px]"
+        />
         {name}
         {u && <span className="text-[10px] text-fg-muted">{t(`roles.${u.role}`)}</span>}
         {isAdmin && from && (

client/src/components/users/UserAvatar.tsx

@@ -4,7 +4,9 @@
  * (`GET /api/me/avatar`) or, with `userId`, another's (`GET
  * /api/users/:id/avatar`, staff only), versioned by `avatarAt`; without one —
  * or when the image fails to load — the first letters of its name. Used by the
- * sidebar's account row, its workspace owner groups and Settings → Account.
+ * sidebar's account row, its workspace owner groups, Settings → Account, the
+ * Users page and its editor, the pool board and member picker, and System
+ * Health's per-user CPU/RAM card.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 

client/src/components/users/UserEditDialog.tsx

@@ -33,6 +33,7 @@ import { copyText } from "../../lib/clipboard";
 import { isSubmitEnter } from "../../lib/keys";
 import { passwordProblems } from "../../lib/passwordRules";
 import { PasswordRules } from "./PasswordRules";
+import { UserAvatar } from "./UserAvatar";
 import { useDialog } from "../../hooks/useDialog";
 import { Switch } from "../Switch";
 import { Checkbox } from "../Checkbox";
@@ -243,12 +244,12 @@ export function UserEditDialog({
         className="flex max-h-[90vh] w-full max-w-2xl flex-col overflow-hidden rounded-xl border border-border bg-surface-1 shadow-xl"
       >
         <div className="flex items-start gap-3 border-b border-border px-5 py-4">
-          <span
-            aria-hidden
-            className="flex h-10 w-10 flex-shrink-0 items-center justify-center rounded-full bg-accent/15 text-sm font-semibold uppercase text-accent"
-          >
-            {shown.slice(0, 2)}
-          </span>
+          <UserAvatar
+            name={shown}
+            userId={user.id}
+            avatarAt={user.avatarAt}
+            className="h-10 w-10 text-sm"
+          />
           <div className="min-w-0 flex-1">
             <h2 id="user-edit-title" className="text-base font-semibold text-fg-primary">
               {t("edit.title", { name: user.displayName || user.username })}

client/src/components/users/__tests__/AccountPoolCard.test.tsx

@@ -33,7 +33,7 @@ const accountPool = vi.hoisted(() => ({
   updateGroup: vi.fn(),
   deleteGroup: vi.fn(),
 }));
-const users = vi.hoisted(() => ({ list: vi.fn() }));
+const users = vi.hoisted(() => ({ list: vi.fn(), avatarUrl: () => null }));
 const aiTools = vi.hoisted(() => ({
   list: vi.fn(),
   ompSharing: vi.fn(),

client/src/components/users/__tests__/UserEditDialog.test.tsx

@@ -13,7 +13,12 @@ import { render, screen, waitFor } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import type { ServerUserUsage } from "../../../lib/api";
 
-const users = vi.hoisted(() => ({ get: vi.fn(), update: vi.fn(), remove: vi.fn() }));
+const users = vi.hoisted(() => ({
+  get: vi.fn(),
+  update: vi.fn(),
+  remove: vi.fn(),
+  avatarUrl: () => null,
+}));
 const confirmDialog = vi.hoisted(() => vi.fn());
 vi.mock("../../../lib/confirm", () => ({ confirmDialog }));
 const lanes = vi.hoisted(() => ({ list: vi.fn() }));

client/src/components/users/__tests__/UserQuota.test.tsx

@@ -16,6 +16,7 @@ const users = vi.hoisted(() => ({
   setQuotaDefault: vi.fn(),
   update: vi.fn(),
   get: vi.fn(),
+  avatarUrl: () => null,
 }));
 const lanes = vi.hoisted(() => ({ list: vi.fn() }));
 vi.mock("../../../lib/api", async (importOriginal) => {

client/src/i18n/locales/en/users.json

@@ -79,6 +79,7 @@
     "EBADUSER": "Username: letters, digits, '.', '_' or '-' (up to 64).",
     "EBADPASSWORD": "Password cannot be empty.",
     "EBADEMAIL": "That email address does not look valid.",
+    "ENAMETAKEN": "Another account already uses that name. Pick one that is yours.",
     "EBADFIELD": "One of the values is not valid.",
     "ENOLANE": "That workspace no longer exists.",
     "ENOTOWNED": "That workspace is not this user's any more.",

client/src/i18n/locales/vi/users.json

@@ -79,6 +79,7 @@
     "EBADUSER": "Tên đăng nhập: chữ, số, '.', '_' hoặc '-' (tối đa 64 ký tự).",
     "EBADPASSWORD": "Mật khẩu không được để trống.",
     "EBADEMAIL": "Địa chỉ email không hợp lệ.",
+    "ENAMETAKEN": "Tên này đã có tài khoản khác dùng. Hãy chọn tên của chính bạn.",
     "EBADFIELD": "Có một giá trị không hợp lệ.",
     "ENOLANE": "Workspace đó không còn tồn tại.",
     "ENOTOWNED": "Workspace đó không còn thuộc người này.",

client/src/lib/api.ts

@@ -684,6 +684,8 @@ export interface HostUsageGroup {
   username?: string;
   /** The user's display name, null when none is set (absent from an older server). */
   displayName?: string | null;
+  /** When the user's avatar was last set (null = none; absent from an older server). */
+  avatarAt?: string | null;
   /** % of the whole machine's CPU (100 = every core busy) over the sample. */
   cpu: number;
   /** Resident memory, bytes (shared pages count in every process). */

client/src/pages/Artifacts.tsx

@@ -48,7 +48,8 @@
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
-import { useCallback, useEffect, useRef, useState } from "react";
+import { useCallback, useEffect, useLayoutEffect, useRef, useState } from "react";
+import { createPortal } from "react-dom";
 import { useTranslation } from "react-i18next";
 import {
   ChevronRight,
@@ -1629,12 +1630,41 @@ function DetailDialog({
   );
 }
 
-/** "N installs" on a card; a click lists who installed it, when, and where. */
+/** "N installs" on a card; a click lists who installed it, when, and where.
+ *  The list floats over the page (a portal at the button, below it or above
+ *  when there is no room, kept inside the window): inside the card list's
+ *  `overflow-hidden` it was cut off at the last card. */
 function InstallsButton({ item }: { item: Artifact }) {
   const { t } = useTranslation("artifacts");
   const [open, setOpen] = useState(false);
   const [data, setData] = useState<ArtifactInstalls | null>(null);
   const box = useRef<HTMLSpanElement>(null);
+  const pop = useRef<HTMLDivElement>(null);
+  const [at, setAt] = useState<{ left: number; top: number } | null>(null);
+
+  useLayoutEffect(() => {
+    if (!open) return setAt(null);
+    const place = () => {
+      const b = box.current?.getBoundingClientRect();
+      const p = pop.current;
+      if (!b || !p) return;
+      const w = p.offsetWidth;
+      const h = p.offsetHeight;
+      const gap = 4;
+      const below = b.bottom + gap + h <= window.innerHeight - 8 || b.top - gap - h < 8;
+      setAt({
+        left: Math.max(8, Math.min(b.left, window.innerWidth - w - 8)),
+        top: below ? b.bottom + gap : b.top - gap - h,
+      });
+    };
+    place();
+    window.addEventListener("resize", place);
+    window.addEventListener("scroll", place, true);
+    return () => {
+      window.removeEventListener("resize", place);
+      window.removeEventListener("scroll", place, true);
+    };
+  }, [open, data]);
 
   useEffect(() => {
     if (!open) return;
@@ -1647,7 +1677,8 @@ function InstallsButton({ item }: { item: Artifact }) {
         toast.error(err);
       });
     const onDown = (e: MouseEvent) => {
-      if (!box.current?.contains(e.target as Node)) setOpen(false);
+      const n = e.target as Node;
+      if (!box.current?.contains(n) && !pop.current?.contains(n)) setOpen(false);
     };
     const onKey = (e: KeyboardEvent) => {
       if (e.key === "Escape") setOpen(false);
@@ -1670,66 +1701,70 @@ function InstallsButton({ item }: { item: Artifact }) {
       >
         {t("installs", { count: item.installs })}
       </button>
-      {open && (
-        <div
-          role="dialog"
-          aria-label={t("installsTitle")}
-          data-testid="artifact-installs"
-          className="absolute left-0 z-30 mt-1 w-80 max-w-[80vw] rounded-lg border border-border bg-surface-1 p-2 shadow-xl"
-        >
-          <p className="mb-1.5 px-1 text-xs font-medium text-fg-primary">{t("installsTitle")}</p>
-          {data === null ? (
-            <p className="px-1 text-xs text-fg-muted">{t("loading")}</p>
-          ) : (
-            <ul className="max-h-64 space-y-1 overflow-auto">
-              {data.items.map((i, n) => (
-                <li key={n} className="rounded px-1.5 py-1 text-xs hover:bg-surface-2">
-                  <div className="flex items-center gap-2">
-                    <span className="min-w-0 flex-1 truncate text-fg-primary">
-                      {i.mine ? t("installsYou") : (i.user ?? t("installsUnknown"))}
-                      {i.replaced && (
-                        <span className="ml-1 text-fg-muted">· {t("installsReplaced")}</span>
-                      )}
-                    </span>
-                    <span className="shrink-0 text-[11px] text-fg-muted">
-                      {new Date(i.at).toLocaleString()}
-                    </span>
-                  </div>
-                  {i.paths && (
-                    <div className="mt-0.5 space-y-0.5">
-                      {i.paths.length ? (
-                        i.paths.map((p) => (
-                          <p
-                            key={p}
-                            className="truncate font-mono text-[10px] text-fg-muted"
-                            title={p}
-                          >
-                            {p}
-                          </p>
-                        ))
-                      ) : (
-                        <p className="font-mono text-[10px] text-fg-muted">
-                          {t("installsPluginWhere")}
-                        </p>
-                      )}
+      {open &&
+        createPortal(
+          <div
+            ref={pop}
+            role="dialog"
+            aria-label={t("installsTitle")}
+            data-testid="artifact-installs"
+            style={at ? { left: at.left, top: at.top } : { left: 0, top: 0, visibility: "hidden" }}
+            className="fixed z-[60] w-80 max-w-[80vw] rounded-lg border border-border bg-surface-1 p-2 shadow-xl"
+          >
+            <p className="mb-1.5 px-1 text-xs font-medium text-fg-primary">{t("installsTitle")}</p>
+            {data === null ? (
+              <p className="px-1 text-xs text-fg-muted">{t("loading")}</p>
+            ) : (
+              <ul className="max-h-64 space-y-1 overflow-auto">
+                {data.items.map((i, n) => (
+                  <li key={n} className="rounded px-1.5 py-1 text-xs hover:bg-surface-2">
+                    <div className="flex items-center gap-2">
+                      <span className="min-w-0 flex-1 truncate text-fg-primary">
+                        {i.mine ? t("installsYou") : (i.user ?? t("installsUnknown"))}
+                        {i.replaced && (
+                          <span className="ml-1 text-fg-muted">· {t("installsReplaced")}</span>
+                        )}
+                      </span>
+                      <span className="shrink-0 text-[11px] text-fg-muted">
+                        {new Date(i.at).toLocaleString()}
+                      </span>
                     </div>
-                  )}
-                </li>
-              ))}
-              {data.unrecorded > 0 && (
-                <li className="px-1.5 py-1 text-[11px] text-fg-muted">
-                  {t("installsUnrecorded", { count: data.unrecorded })}
-                </li>
-              )}
-              {data.items.length === 0 && data.unrecorded === 0 && (
-                <li className="px-1.5 py-1 text-[11px] text-fg-muted">
-                  {t("installsNoneOfYours")}
-                </li>
-              )}
-            </ul>
-          )}
-        </div>
-      )}
+                    {i.paths && (
+                      <div className="mt-0.5 space-y-0.5">
+                        {i.paths.length ? (
+                          i.paths.map((p) => (
+                            <p
+                              key={p}
+                              className="truncate font-mono text-[10px] text-fg-muted"
+                              title={p}
+                            >
+                              {p}
+                            </p>
+                          ))
+                        ) : (
+                          <p className="font-mono text-[10px] text-fg-muted">
+                            {t("installsPluginWhere")}
+                          </p>
+                        )}
+                      </div>
+                    )}
+                  </li>
+                ))}
+                {data.unrecorded > 0 && (
+                  <li className="px-1.5 py-1 text-[11px] text-fg-muted">
+                    {t("installsUnrecorded", { count: data.unrecorded })}
+                  </li>
+                )}
+                {data.items.length === 0 && data.unrecorded === 0 && (
+                  <li className="px-1.5 py-1 text-[11px] text-fg-muted">
+                    {t("installsNoneOfYours")}
+                  </li>
+                )}
+              </ul>
+            )}
+          </div>,
+          document.body
+        )}
     </span>
   );
 }

client/src/pages/__tests__/Artifacts.test.tsx

@@ -362,6 +362,11 @@ describe("Artifacts", () => {
     expect(await within(box).findByText("/h/.claude/skills/deploy")).toBeInTheDocument();
     expect(within(box).getByText(/khoa/)).toBeInTheDocument();
     expect(within(box).getByText(/1 earlier installs/)).toBeInTheDocument();
+    // Over the page, outside the card list that clips its overflow — and a
+    // click inside it keeps it open.
+    expect(box.parentElement).toBe(document.body);
+    await user.click(within(box).getByText(/khoa/));
+    expect(screen.getByTestId("artifact-installs")).toBeInTheDocument();
     await user.keyboard("{Escape}");
     expect(screen.queryByTestId("artifact-installs")).toBeNull();
   });

client/src/pages/__tests__/__snapshots__/screens.snapshot.test.tsx.snap

@@ -7316,7 +7316,7 @@ exports[`screen snapshots > Settings — about 1`] = `
                 <span
                   class="text-status-warning/90"
                 >
-                  UI build v2.8.34 (rebuild client to match)
+                  UI build v2.8.39 (rebuild client to match)
                 </span>
               </p>
             </div>

docs/API.md

@@ -89,9 +89,9 @@ A dashboard shared by several people runs in **server mode** ([SERVER-MODE.md](S
 | `POST /api/auth/login` `{username, password}` | `{user}` + the cookie; `401 EBADLOGIN`, `429 ETOOMANY`, `404 ENOTSERVER` in local mode |
 | `POST /api/auth/logout` | `{ok: true}`, cookie cleared |
 
-In server mode a **developer** sees only rows of the workspaces they own (`lanes.owner_id`): every list, count, chart and cost answer is limited to them, and a request naming another user's session, agent, workspace or run (in the path, query or body) answers `404 ENOTFOUND`. Admin and analyst see everything; `GET /api/users` lists every account (`displayName`, `email`, `createdAt`, `logins`, `lastLoginAt` — the last login ever, kept after it ends —, `mustChangePassword` included) with its workspaces, sessions and `today` (since the viewer's local midnight — `?tz_offset=` is the browser's `getTimezoneOffset()`, UTC without it) / 7 / 30-day `{cost, tokens}`, `GET /api/users/storage[?refresh=1]` each user's home size (`{storage: {<id>: {bytes, files, partial, measuredAt} | null}, measuring}` — measured in the background, see [SERVER-MODE.md](SERVER-MODE.md)), `GET /api/users/tmux` each member's own tmux server under one Linux user per account (`{available, installed, matched, users: [{id, username, running, stuck?, version, pid, startedAt, sessions, busy, outdated}]}`; an admin's `POST /api/users/:id/tmux-restart` and `POST /api/users/tmux-restart-idle` restart them with `currentPassword`, audited, `409 ETMUXSTUCK` for a server that will not stop), `GET /api/host` the machine and each user's live share of it (`{at, hostname, os, uptime, cpu: {model, cores, load}, memory: {total, available, used, swapTotal, swapUsed}, disks: [{device, mount, type, kind: "HDD"|"SSD"|null, total, used, free}], homesMount, gpus: [{name, utilization, memoryUsed, memoryTotal}], usage: {cpu, sampleMs, groups: [{key, kind: "user"|"host"|"system", userId?, username?, cpu, memory, memoryPercent, processes, top: [{pid, name, cpu, memory}]}]} | null, bootTime, network: [{name, rx, tx}], diskIo: [{name, read, write}], temperatures: [{chip, label, celsius}], pressure: {cpu, memory, io: {some10, some60, full10} | null} | null (Linux PSI, `/proc/pressure/*`: % of the last 10 / 60 s tasks stalled on it), topProcesses: [{pid, name, cpu, memory, group}], process: {pid, node, uptime, rss, heapUsed}}`, `cpu` also carrying `physicalCores` and `perCore` (busy % per thread), rates in bytes/s over the sample — read-only, cached 3 s, `usage` null and the lists empty off Linux), `GET /api/host/history?range=1h|6h|24h` the CPU/memory history every server on Linux keeps in memory since it started (both read by the Dashboard's System Health tab and open to every signed-in user — `/host` is not staff-only) (`{range, intervalMs, running, startedAt, points: [{at, cpu, memory, memoryUsed, swapUsed, load1, users: {<id>: {cpu, memory}}}]}`, one point per 30 s, averaged to ≤ 360), `GET /api/users/:id/details[?tz_offset=]` one account in full for the Administration page's user detail (`{user (with logins, lastLoginAt), sessions: {total, active, firstAt, lastAt}, usage: {today, last7d, last30d, daily: [{date, cost, tokens}] (30 local days, oldest first), byTool, byModel: [{key, cost, tokens, sessions}]}, workspaces: [{id, title, cwd, tool, kind, branch, status, createdAt, sessions, lastActiveAt, livePanes}], panes: [{id, laneId, laneTitle, laneCwd, tool, model, account, proxy, sessionId, startedAt, status}], recentSessions (15, with cost/tokens), pool: {claude|codex|cursor: {pin, group, accounts: [{name, kind, email, expired, allowed, pinned, quota, quotaPercent, full, livePanes, spend5h, spend7d, userSpend5h, userSpend7d, userTokens5h, userTokens7d, userRuns7d, userLivePanes, userLastAt}]}}, audit}` — `user*` fields are only the runs on that user's workspaces; never a token; `404 ENOUSER`), and `GET /api/users/audit[?limit=]` the staff reads of developers' sessions and admins' account changes (kept `AGENTHUB_AUDIT_DAYS` days, default 180, `0` = forever) (`reader`/`owner` are usernames, `reader_display`/`owner_display` their display names or null) (all `403 EADMIN` for a developer). `GET /api/users` also carries each account's [spend quota](SERVER-MODE.md#spend-quotas) — `quotaSetting` (`{mode: "default"|"unlimited"|"custom", limit_usd?, period?, tz_offset?}`) and `quota` (the one binding them now with `spend`, `pct`, `exceeded`, `resetsAt`, or null) — and the top-level `quotaDefault`; an admin sets the default with `PUT /api/users/quota-default` `{quota: {limit_usd, period, tz_offset} | null, currentPassword}` and a user's own with `PATCH /api/users/:id` `{quota}` (`400 EBADQUOTA`). A workspace owner over their quota gets `429 EQUOTA` from `POST /api/run` and `POST /api/lanes/:id/start`. See [SERVER-MODE.md](SERVER-MODE.md#what-each-user-sees).
+In server mode a **developer** sees only rows of the workspaces they own (`lanes.owner_id`): every list, count, chart and cost answer is limited to them, and a request naming another user's session, agent, workspace or run (in the path, query or body) answers `404 ENOTFOUND`. Admin and analyst see everything; `GET /api/users` lists every account (`displayName`, `email`, `createdAt`, `logins`, `lastLoginAt` — the last login ever, kept after it ends —, `mustChangePassword` included) with its workspaces, sessions and `today` (since the viewer's local midnight — `?tz_offset=` is the browser's `getTimezoneOffset()`, UTC without it) / 7 / 30-day `{cost, tokens}`, `GET /api/users/storage[?refresh=1]` each user's home size (`{storage: {<id>: {bytes, files, partial, measuredAt} | null}, measuring}` — measured in the background, see [SERVER-MODE.md](SERVER-MODE.md)), `GET /api/users/tmux` each member's own tmux server under one Linux user per account (`{available, installed, matched, users: [{id, username, running, stuck?, version, pid, startedAt, sessions, busy, outdated}]}`; an admin's `POST /api/users/:id/tmux-restart` and `POST /api/users/tmux-restart-idle` restart them with `currentPassword`, audited, `409 ETMUXSTUCK` for a server that will not stop), `GET /api/host` the machine and each user's live share of it (`{at, hostname, os, uptime, cpu: {model, cores, load}, memory: {total, available, used, swapTotal, swapUsed}, disks: [{device, mount, type, kind: "HDD"|"SSD"|null, total, used, free}], homesMount, gpus: [{name, utilization, memoryUsed, memoryTotal}], usage: {cpu, sampleMs, groups: [{key, kind: "user"|"host"|"system", userId?, username?, displayName?, avatarAt?, cpu, memory, memoryPercent, processes, top: [{pid, name, cpu, memory}]}]} | null, bootTime, network: [{name, rx, tx}], diskIo: [{name, read, write}], temperatures: [{chip, label, celsius}], pressure: {cpu, memory, io: {some10, some60, full10} | null} | null (Linux PSI, `/proc/pressure/*`: % of the last 10 / 60 s tasks stalled on it), topProcesses: [{pid, name, cpu, memory, group}], process: {pid, node, uptime, rss, heapUsed}}`, `cpu` also carrying `physicalCores` and `perCore` (busy % per thread), rates in bytes/s over the sample — read-only, cached 3 s, `usage` null and the lists empty off Linux), `GET /api/host/history?range=1h|6h|24h` the CPU/memory history every server on Linux keeps in memory since it started (both read by the Dashboard's System Health tab and open to every signed-in user — `/host` is not staff-only) (`{range, intervalMs, running, startedAt, points: [{at, cpu, memory, memoryUsed, swapUsed, load1, users: {<id>: {cpu, memory}}}]}`, one point per 30 s, averaged to ≤ 360), `GET /api/users/:id/details[?tz_offset=]` one account in full for the Administration page's user detail (`{user (with logins, lastLoginAt), sessions: {total, active, firstAt, lastAt}, usage: {today, last7d, last30d, daily: [{date, cost, tokens}] (30 local days, oldest first), byTool, byModel: [{key, cost, tokens, sessions}]}, workspaces: [{id, title, cwd, tool, kind, branch, status, createdAt, sessions, lastActiveAt, livePanes}], panes: [{id, laneId, laneTitle, laneCwd, tool, model, account, proxy, sessionId, startedAt, status}], recentSessions (15, with cost/tokens), pool: {claude|codex|cursor: {pin, group, accounts: [{name, kind, email, expired, allowed, pinned, quota, quotaPercent, full, livePanes, spend5h, spend7d, userSpend5h, userSpend7d, userTokens5h, userTokens7d, userRuns7d, userLivePanes, userLastAt}]}}, audit}` — `user*` fields are only the runs on that user's workspaces; never a token; `404 ENOUSER`), and `GET /api/users/audit[?limit=]` the staff reads of developers' sessions and admins' account changes (kept `AGENTHUB_AUDIT_DAYS` days, default 180, `0` = forever) (`reader`/`owner` are usernames, `reader_display`/`owner_display` their display names or null) (all `403 EADMIN` for a developer). `GET /api/users` also carries each account's [spend quota](SERVER-MODE.md#spend-quotas) — `quotaSetting` (`{mode: "default"|"unlimited"|"custom", limit_usd?, period?, tz_offset?}`) and `quota` (the one binding them now with `spend`, `pct`, `exceeded`, `resetsAt`, or null) — and the top-level `quotaDefault`; an admin sets the default with `PUT /api/users/quota-default` `{quota: {limit_usd, period, tz_offset} | null, currentPassword}` and a user's own with `PATCH /api/users/:id` `{quota}` (`400 EBADQUOTA`). A workspace owner over their quota gets `429 EQUOTA` from `POST /api/run` and `POST /api/lanes/:id/start`. See [SERVER-MODE.md](SERVER-MODE.md#what-each-user-sees).
 
-An admin changes accounts with `POST /api/users` (`{username, password, role}` → `201 {user}`; the password may be any non-empty starting one and the account gets `mustChangePassword: true`), `GET /api/users/:id` (`{user, workspaces: [{id, title, cwd}]}`, the account with `logins` and `lastLoginAt`, for the Edit form; admin or analyst), `GET /api/users/:id/avatar` (that account's picture for the sidebar's owner groups — admin or analyst, `nosniff` + `sandbox` CSP, `404 ENOAVATAR`; a workspace in `GET /api/lanes` carries `owner_avatar_at` to version its URL), `PATCH /api/users/:id` (any of `{displayName?, email?, role?, disabled?, password?, addWorkspaces?: [laneId], removeWorkspaces?: [laneId], signOut?: true}` — every field validated before any is written; `removeWorkspaces` leaves the workspace with no owner and answers `409 ENOTOWNED` for one the user does not own; an admin's own `password`/`signOut` keeps the login it came from; a password for SOMEONE ELSE may be anything non-empty and sets their `mustChangePassword`, the admin's OWN must pass every rule below, `400 EWEAKPASSWORD` with `rules`), `POST /api/users/:id/password` (`{password}`; that user's logins end; the same two bars) `POST /api/users/:id/workspaces` (`{laneId}`; the workspace's owner becomes that user) and `DELETE /api/users/:id` (delete for good: the user's logins, panes, workspaces' records, prefs and — under S3 — their Linux account and whole home, removed FIRST so a refusal (`502 EPROVISION`) leaves every row; `409 ESELF` for yourself, `409 ELASTADMIN` for the last admin; session history and the audit log stay). No path — this API or the `agenthub users` CLI — may demote, disable or delete the last enabled admin (`409 ELASTADMIN`). Every one carries `currentPassword`, the admin's own password: `403 EREAUTH` when it is wrong or missing, `429 ETOOMANY` after 10 wrong tries in 15 minutes. `409 ESELF` for an admin's own role or disable, `409 EEXISTS` for a taken name, `400 EBADUSER`/`EBADPASSWORD`/`EBADROLE`/`EBADEMAIL`/`EBADFIELD`, `404 ENOUSER`/`ENOLANE`; a developer or analyst gets `403 EADMIN`, and local mode `403 ELOCALMODE`. No answer carries a password hash; each change is written to the audit log.
+An admin changes accounts with `POST /api/users` (`{username, password, role}` → `201 {user}`; the password may be any non-empty starting one and the account gets `mustChangePassword: true`), `GET /api/users/:id` (`{user, workspaces: [{id, title, cwd}]}`, the account with `logins` and `lastLoginAt`, for the Edit form; admin or analyst), `GET /api/users/:id/avatar` (that account's picture for the sidebar's owner groups — admin or analyst, `nosniff` + `sandbox` CSP, `404 ENOAVATAR`; a workspace in `GET /api/lanes` carries `owner_avatar_at` to version its URL), `PATCH /api/users/:id` (any of `{displayName?, email?, role?, disabled?, password?, addWorkspaces?: [laneId], removeWorkspaces?: [laneId], signOut?: true}` — every field validated before any is written; `removeWorkspaces` leaves the workspace with no owner and answers `409 ENOTOWNED` for one the user does not own; an admin's own `password`/`signOut` keeps the login it came from; a password for SOMEONE ELSE may be anything non-empty and sets their `mustChangePassword`, the admin's OWN must pass every rule below, `400 EWEAKPASSWORD` with `rules`), `POST /api/users/:id/password` (`{password}`; that user's logins end; the same two bars) `POST /api/users/:id/workspaces` (`{laneId}`; the workspace's owner becomes that user) and `DELETE /api/users/:id` (delete for good: the user's logins, panes, workspaces' records, prefs and — under S3 — their Linux account and whole home, removed FIRST so a refusal (`502 EPROVISION`) leaves every row; `409 ESELF` for yourself, `409 ELASTADMIN` for the last admin; session history and the audit log stay). No path — this API or the `agenthub users` CLI — may demote, disable or delete the last enabled admin (`409 ELASTADMIN`). Every one carries `currentPassword`, the admin's own password: `403 EREAUTH` when it is wrong or missing, `429 ETOOMANY` after 10 wrong tries in 15 minutes. `409 ESELF` for an admin's own role or disable, `409 EEXISTS` for a taken name, `409 ENAMETAKEN` for a `displayName` that reads as another account's (the same rule as `PATCH /api/me/account`), `400 EBADUSER`/`EBADPASSWORD`/`EBADROLE`/`EBADEMAIL`/`EBADFIELD`, `404 ENOUSER`/`ENOLANE`; a developer or analyst gets `403 EADMIN`, and local mode `403 ELOCALMODE`. No answer carries a password hash; each change is written to the audit log.
 
 `GET /api/accounts[?force=1]` lists the Claude account pool ([SERVER-MODE.md](SERVER-MODE.md#claude-account-pool)): `{accounts: [{name, addedAt, expiresAt, expired, livePanes, spend5h, spend7d, tokens5h, tokens7d, quota: {fiveHour, sevenDay, checkedAt, error} | null, quotaPercent, full}], codex: [{name, kind: "apikey"|"chatgpt", addedAt, livePanes, spend5h, spend7d, tokens5h, tokens7d, quota: {windows: [{label, usedPercent, resetsAt}], asOf} | null, quotaPercent, full}], pins: {claude: [{userId, username, account, pinnedAt}], codex: […]}, blockPercent}` — `pins` are the users an admin pinned to one account (empty in local mode, keyed by tool: `claude`, `codex`, `cursor`); `codex` is the [Codex account pool](SERVER-MODE.md#codex-account-pool); `cursor: [{name, kind: "apikey", addedAt, livePanes, …}]` is the [Cursor account pool](SERVER-MODE.md#cursor-account-pool) (API keys; `quota` null, spend 0); `groups: [{id, name, createdAt, users: [{userId, username}], accounts: {claude: [names], codex: […], cursor: […]}}]` are the [pool groups](SERVER-MODE.md#account-pool-groups) (empty in local mode). `spend*`/`tokens*` = the sessions the account's runs held, over the hours they held them (a Codex session counts whole once its run started in the window). It never includes a key or a token. `force=1` re-reads every quota first. Run rows (`/api/run/history`) carry `account`, the pool account their pane ran on (`null` = the machine's own login).
 
@@ -110,7 +110,7 @@ An admin (server mode) adds an account with `POST /api/accounts` `{tool: "claude
 | `PUT /api/me/pool-accounts` `{tool, account: "<name>" \| null}` | the account's new sessions of `tool` run on `account` (`null` = automatic): `{tool, choice, switched}` — `switched` as for an admin's pin (a Claude login goes into the home at once). Below an admin's pin (`409 ELOCKED`), only an account the group allows (`404 ENOACCOUNT`), `400 EBADTOOL`; login cookie only, audited |
 | `POST /api/me/onboarded` | the first-run setup is done or skipped (kept from the first call) |
 | `GET /api/me/account` | Settings → Account. Server mode: `{mode: "server", user: {id, username, role, disabled, displayName, email, avatarAt, createdAt}, workspaces, sessions, logins, lastLoginAt}`; local mode `{mode: "local"}` |
-| `PATCH /api/me/account` `{displayName?, email?}` | the account's own profile (`""`/`null` clears), the same shape back; `400 EBADFIELD` (display name over 100 characters or with control characters) / `EBADEMAIL` |
+| `PATCH /api/me/account` `{displayName?, email?}` | the account's own profile (`""`/`null` clears), the same shape back; `400 EBADFIELD` (display name over 100 characters or with control characters) / `EBADEMAIL`; `409 ENAMETAKEN` for a display name that reads as another account's display name or username (marks, case, punctuation, bracketed parts like "(you)" and look-alike letters ignored; keeping the name you have is always allowed) |
 | `POST /api/me/password` `{currentPassword, newPassword}` | `{ok: true}`; every other login of the account ends, this one stays, and `mustChangePassword` clears. The new password must pass every rule — at least 8 characters, a lower-case and an upper-case letter, a digit, a symbol, not containing the username — and differ from the current one: `400 EWEAKPASSWORD` with `error.rules` (`length`, `lower`, `upper`, `digit`, `symbol`, `username`, `reused`). `403 EREAUTH` wrong current password (`429 ETOOMANY` after 10), `400 EBADPASSWORD` |
 | `POST /api/me/sign-out-others` | `{ended}` — every login of the account but this one ends |
 | `GET /api/me/avatar` | server mode: the account's own picture (`nosniff`, `sandbox` CSP; the client adds `?v=<avatarAt>`), `404 ENOAVATAR` when it has none |

docs/SERVER-MODE.md

@@ -372,7 +372,13 @@ Wherever the dashboard names a person — the sidebar's sign-out tooltip, the
 workspace list's owner groups, the Users page and its audit log, the Edit user
 form — it shows their display name when one is set, else the username (the
 Users page keeps `@username` beside a display name). Logging in, the CLI and
-the Linux account always use the username.
+the Linux account always use the username. No one can pose as a colleague: a
+display name that reads as another account's display name or username — marks,
+case, spaces, punctuation, a bracketed part like "(you)" and look-alike letters
+from other alphabets ignored — is refused (`409 ENAMETAKEN`), whether the user
+sets it in Settings → Account or an admin does on the Users page. A name an
+account already has is kept on an unrelated save; rename an old clash from the
+Users page.
 
 Under S3 an admin's folder browser opens on their own home too; ticking
 **Server folder** opens the host account's home (`/home/<host>`), where a

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "agenthub",
-  "version": "2.8.34",
+  "version": "2.8.39",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "agenthub",
-      "version": "2.8.34",
+      "version": "2.8.39",
       "hasInstallScript": true,
       "license": "UNLICENSED",
       "dependencies": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "agenthub",
-  "version": "2.8.34",
+  "version": "2.8.39",
   "bin": {
     "agenthub": "bin/agenthub.js"
   },

server/__tests__/server-mode-user-edit.test.js

@@ -222,6 +222,26 @@ describe("Settings → Account (/api/me)", () => {
     assert.equal(bad.body.error.code, "EBADEMAIL");
   });
 
+  it("refuses a display name that reads as another account's (ENAMETAKEN)", async () => {
+    assert.equal(auth.nameKey("Nguyễn Ngọc Trí Vĩ (you)"), auth.nameKey("nguyen.ngoc-tri VI"));
+    assert.equal(auth.nameKey("Đào"), "dao");
+    // Cyrillic о and а in place of Latin letters.
+    assert.equal(auth.nameKey("Mіа Trоn"), auth.nameKey("Mia Tron"));
+    const leo = await login("leo", "member-pass-2");
+    // mia's display name is "Mia Tran"; boss has none, only a username.
+    for (const name of ["MIA TRẦN (you)", "Mia\u200b Tran", "mia", "Bóss"]) {
+      const r = await call("PATCH", "/api/me/account", { cookie: leo, body: { displayName: name } });
+      assert.equal(r.status, 409, name);
+      assert.equal(r.body.error.code, "ENAMETAKEN");
+    }
+    assert.equal(auth.findUser("leo").display_name, "Leo N");
+    // Keeping one's own name, or a name of one's own, still works.
+    for (const name of ["Leo N", "Leo Nguyen"]) {
+      const r = await call("PATCH", "/api/me/account", { cookie: leo, body: { displayName: name } });
+      assert.equal(r.status, 200, name);
+    }
+  });
+
   it("changes its own password only with the old one, keeping this login", async () => {
     const leo = await login("leo", "member-pass-2");
     const other = await login("leo", "member-pass-2");

server/lib/auth.js

@@ -20,7 +20,8 @@
  *   admin on the Users page (`server/routes/users.js`), where every change
  *   needs the admin's own password again (`confirmPassword`, throttled).
  *   An account also carries an optional display name and email
- *   (`validateProfile`), which its owner edits in Settings → Account without
+ *   (`validateProfile`; no two accounts may read as one name — `assertNameFree`,
+ *   ENAMETAKEN), which its owner edits in Settings → Account without
  *   that step-up; changing their OWN password there needs the old one and
  *   keeps the login it was changed from (`setPassword`'s `keepToken`).
  * - Two password bars: an admin may GIVE any non-empty password (a create or a
@@ -247,6 +248,47 @@ function validateProfile(body) {
   return out;
 }
 
+// Latin look-alikes from other scripts, so "Vĩ" in Cyrillic still collides.
+const CONFUSABLE = {
+  а: "a", в: "b", е: "e", к: "k", м: "m", н: "h", о: "o", р: "p", с: "c", т: "t",
+  у: "y", х: "x", і: "i", ј: "j", ԁ: "d", ѕ: "s", ӏ: "l", α: "a", β: "b", ε: "e",
+  η: "n", ι: "i", κ: "k", ν: "v", ο: "o", ρ: "p", τ: "t", υ: "u", χ: "x", "ı": "i",
+};
+
+/**
+ * The name two accounts may not share: no marks (Vĩ = Vi), đ = d, any case,
+ * look-alike letters folded, and only letters and digits outside brackets —
+ * so "Nguyễn Ngọc Trí Vĩ (you)" and "nguyen.ngoc-tri vi" are both one name.
+ */
+function nameKey(s) {
+  return String(s || "")
+    .normalize("NFKD")
+    .replace(/\p{M}/gu, "")
+    .toLowerCase()
+    .replace(/\([^)]*\)|\[[^\]]*\]/g, "")
+    .replace(/[đð]/g, "d")
+    .replace(/./gu, (c) => CONFUSABLE[c] ?? c)
+    .replace(/[^\p{L}\p{N}]/gu, "");
+}
+
+/**
+ * Refuse (ENAMETAKEN) a display name that reads as another account's display
+ * name or username, so no one can pose as a colleague. Keeping the name one
+ * already has is always allowed — a clash from before this rule is no reason
+ * to block an admin's unrelated edit.
+ */
+function assertNameFree(userId, fields) {
+  if (!("display_name" in fields) || !fields.display_name) return;
+  const key = nameKey(fields.display_name);
+  if (!key) return;
+  const own = sql("SELECT display_name FROM users WHERE id = ?").get(userId);
+  if (own && own.display_name === fields.display_name) return;
+  const rows = sql("SELECT id, username, display_name FROM users WHERE id != ?").all(userId);
+  if (rows.some((u) => nameKey(u.username) === key || nameKey(u.display_name) === key)) {
+    throw err("ENAMETAKEN", "displayName: another account already uses that name");
+  }
+}
+
 /** Write `validateProfile`'s result for one account. */
 function setProfile(userId, fields) {
   for (const [col, value] of Object.entries(fields)) {
@@ -812,6 +854,8 @@ module.exports = {
   unassignWorkspace,
   ownedWorkspaces,
   validateProfile,
+  nameKey,
+  assertNameFree,
   setProfile,
   validatePassword,
   validateOwnPassword,

server/lib/host-stats.js

@@ -555,12 +555,13 @@ async function usage(t0, t1, p0, p1, mem) {
 
 const round = (n) => Math.round(n * 10) / 10;
 
-/** A user's group fields: id, username and display name (every viewer reads them). */
+/** A user's group fields: id, username, display name and avatar version (every viewer reads them). */
 const userExtra = (u) => ({
   kind: "user",
   userId: u.id,
   username: u.username,
   displayName: u.displayName ?? null,
+  avatarAt: u.avatarAt ?? null,
 });
 
 async function collect() {

server/routes/me.js

@@ -197,6 +197,7 @@ const { recordAccountChange } = require("../lib/audit");
 const ACCOUNT_STATUS = {
   EBADFIELD: 400,
   EBADEMAIL: 400,
+  ENAMETAKEN: 409,
   EBADPASSWORD: 400,
   EWEAKPASSWORD: 400,
   EBADIMAGE: 400,
@@ -262,6 +263,7 @@ router.patch(
   sameOriginGuard,
   accountWrite(async (_req, user, body) => {
     const fields = auth.validateProfile({ displayName: body.displayName, email: body.email });
+    auth.assertNameFree(user.id, fields);
     auth.setProfile(user.id, fields);
     return { out: accountView(user.id), action: "own profile" };
   })

server/routes/users.js

@@ -171,6 +171,7 @@ router.get("/tmux", (_req, res) => {
 const STATUS = {
   EBADUSER: 400,
   EBADEMAIL: 400,
+  ENAMETAKEN: 409,
   ENOTOWNED: 409,
   EBADPASSWORD: 400,
   EWEAKPASSWORD: 400,
@@ -562,6 +563,7 @@ router.patch(
 
     // 1. Validate everything — nothing is written until all of it passes.
     const profile = auth.validateProfile(body);
+    auth.assertNameFree(u.id, profile);
     const roleChange = body.role !== undefined && body.role !== u.role;
     if (roleChange) {
       if (self) throw ESELF("you cannot change your own role");