feat: v2.7.6 — edit users in one form, Settings → Account, display names, copy over plain HTTP

- Users page: one Edit user form (display name, email, role, active, a new or
  generated password, workspaces given or taken back, sign out everywhere),
  validated as a whole before anything is written (PATCH /api/users/:id,
  GET /api/users/:id); users.display_name/email added migration-safe.
- Settings → Account for every signed-in user: profile, own password (the
  current one required, this login kept), sign out other devices
  (/api/me/account, /api/me/password, /api/me/sign-out-others; login cookie
  only, never a pane token).
- Display names wherever a person is named (sidebar, workspace owner groups,
  Users page and audit log); owner_display_name / reader_display additive.
- Users page: admins add and remove Claude/Codex pool accounts.
- Folder browser: an admin with their own Linux account opens in their home;
  the "Server folder" tick opens the host's (never remembered).
- AI Proxy: "Config 9router" beside Add profile when 9router is installed,
  opened on the dashboard's own host (GET /api/ai-proxies/9router).
- Terminal: a tmux selection reaches the clipboard over plain HTTP too
  (writeClipboard's textarea fallback, focus handed back).
- Chat: a file the session touched outside the workspace previews
  (GET /api/sessions/:id/file).
- install-system: `!requiretty` only when visudo accepts it (sudo-rs on
  Ubuntu 25.10+ rejects the setting).
- openapi.yaml regenerated; docs (API, SERVER-MODE, LANES) updated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

client/src/pages/SettingsHub.tsx

@@ -8,7 +8,10 @@
  * clears), and one page per section. A `#anchor` in the URL scrolls to the
  * element with that `id` or `data-settings-anchor` and briefly highlights it.
  * Back returns to the page before Settings when there is one, else /workspace;
- * an unknown section shows a skeleton until the tool list loads, then toasts
+ * In server mode a signed-in account gets **Account** first (its own
+ * information, display name/email, password and sign-ins —
+ * `AccountSettings`); local mode has no account and no such section.
+ * An unknown section shows a skeleton until the tool list loads, then toasts
  * and falls back to Appearance (which also holds the language and the pet;
  * `general` and `pet` redirect there). Small pages share one: System is the old
  * About (`about` redirects), Git holds git logins and worktree suggestions
@@ -48,6 +51,7 @@ import {
   Router,
   Search,
   Server,
+  UserRound,
 } from "lucide-react";
 import { Settings } from "./Settings";
 import { useSettingsHref } from "../lib/settingsLink";
@@ -57,6 +61,7 @@ import { AiToolConfig } from "./AiToolConfig";
 import { AiProxyConfig } from "./AiProxyConfig";
 import { GitCredentialsConfig } from "./GitCredentialsConfig";
 import { AppearanceSettings } from "../components/settings/AppearanceSettings";
+import { AccountSettings } from "../components/settings/AccountSettings";
 import { SnapshotSettings } from "../components/settings/SnapshotSettings";
 import { ReportSettings } from "../components/settings/ReportSettings";
 import { AiToolsSettings } from "../components/settings/AiToolsSettings";
@@ -73,7 +78,7 @@ import {
 import { Skeleton } from "../components/Skeleton";
 import { AiToolIcon } from "../components/AiToolIcon";
 import { toast } from "../lib/toast";
-import { usePermissions } from "../components/AuthGate";
+import { useAuth, usePermissions } from "../components/AuthGate";
 import { PageTabs } from "../components/PageTabs";
 
 const GROUPS = ["general", "agents", "data"] as const;
@@ -237,12 +242,25 @@ export function SettingsHub({ section }: { section?: string } = {}) {
   }, [location.key, location.hash]);
 
   const { isAdmin } = usePermissions();
+  const authState = useAuth().state;
+  const signedIn = authState.mode === "server" && !!authState.user;
   const enabled = (id: string) => aiTools.byId(id)?.enabled !== false;
   const s = (key: string) => ({
     title: t(`settingsNav.section.${key}.title`),
     description: t(`settingsNav.section.${key}.description`),
   });
   const allSections: Section[] = [
+    ...(signedIn
+      ? [
+          {
+            id: "account",
+            group: "general" as const,
+            Icon: UserRound,
+            ...s("account"),
+            render: () => <AccountSettings />,
+          },
+        ]
+      : []),
     {
       id: "appearance",
       group: "general",