feat: v2.8.0 — Artifacts uploads and plugin links, console tab combos, account avatars

- Artifacts hub: upload a file from the computer; make a skill by uploading a
  Markdown file, files, a folder or a .zip/.skill, or by writing it in the
  dialog; add plugins by picking from the list a marketplace link answers
  (POST /api/artifacts/plugin/inspect); Settings → AI tools → Artifacts Hub.
- Console tabs are combos of up to four split panes (ConsoleTabs, PaneGrid).
- Accounts: an own avatar (PUT/DELETE /api/me/avatar, raster only, ≤ 1 MB,
  <data dir>/avatars/), shown with name and role at the sidebar's foot and on
  the workspace owner groups (GET /api/users/:id/avatar, owner_avatar_at).
- Users page: per-user storage (GET /api/users/storage, measured in a worker)
  and account-pool spend/tokens per account (server/lib/pool-usage.js).

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

client/src/components/run/ConsoleTabs.tsx

@@ -25,7 +25,10 @@
  * bar takes that pane out into a tab of its own there. Dropped on the MIDDLE
  * of another tab, a tab (or a pane header) joins that tab instead
  * (`joinGroup`: side by side, then under the right pane, then under the left
- * one, up to four panes). A right-click on a tab
+ * one, up to four panes). A pane drag held over another tab for `SPRING_MS` shows that tab
+ * (spring-loaded, as a file manager's folder), so the pane can be dropped on
+ * any of its panes' edges; near either end of an overflowing bar a drag
+ * scrolls it. A right-click on a tab
  * opens the same actions as a menu (`ContextMenu`). With tabs from every
  * workspace on, `tabs` spans every workspace (each run's `slot` a `paneKey`)
  * and `workspaceOf` names each tab's workspace before its own name. Settings
@@ -57,7 +60,14 @@ import { isSubmitEnter } from "../../lib/keys";
 import { useAiTools } from "../../hooks/useAiTools";
 import { AiToolIcon } from "../AiToolIcon";
 import { freeSlot, startInFreeTab } from "../lanes/startSession";
-import { PANE_DRAG_TYPE, RunIcon, startPaneDrag, type GroupsUpdate } from "./PaneGrid";
+import {
+  PANE_DRAG_TYPE,
+  RunIcon,
+  paneDragSlot,
+  setDragChip,
+  startPaneDrag,
+  type GroupsUpdate,
+} from "./PaneGrid";
 import { insertionIndex } from "../../lib/laneOrderStorage";
 import {
   type PaneGroups,
@@ -155,6 +165,11 @@ interface Tab {
 
 const URGENCY: RunState[] = ["awaiting", "error", "running"];
 
+/** How long a pane drag rests on a tab before that tab is shown. */
+export const SPRING_MS = 600;
+/** Within this many px of an overflowing bar's end, a drag scrolls it. */
+const EDGE_SCROLL_PX = 40;
+
 /** The Settings tab's key among the tabs' (a group's key is its slots). */
 const SETTINGS_KEY = "settings";
 
@@ -256,8 +271,59 @@ export function ConsoleTabs({
     if (!tab || dragged.current.some((s) => tab.slots.includes(s))) return null;
     return tab.slots.length + Math.max(dragged.current.length, 1) <= MAX_PANES ? i : null;
   };
+  // A pane drag resting on a tab (its drawn index) shows it after SPRING_MS.
+  const spring = useRef<{ at: number; timer: ReturnType<typeof setTimeout> } | null>(null);
+  const stopSpring = () => {
+    if (spring.current) clearTimeout(spring.current.timer);
+    spring.current = null;
+  };
+  useEffect(() => stopSpring, []);
+  const hoveredIndexAt = (x: number) => {
+    const els = [...(listRef.current?.querySelectorAll<HTMLElement>("[data-tab-index]") ?? [])];
+    return els.findIndex((el) => {
+      const b = el.getBoundingClientRect();
+      return x >= b.left && x <= b.right;
+    });
+  };
+  const springAt = (e: DragEvent) => {
+    const slot = paneDragSlot();
+    const i = hoveredIndexAt(e.clientX);
+    const tab = tabs[i];
+    // Only a pane drag, onto a tab not on screen that does not hold it.
+    const target =
+      slot !== null &&
+      tab &&
+      !settings?.active &&
+      tab.index !== groups.active &&
+      !tab.slots.includes(slot)
+        ? i
+        : null;
+    if ((spring.current?.at ?? null) === target) return;
+    stopSpring();
+    if (target === null || !tab) return;
+    const index = tab.index;
+    spring.current = {
+      at: target,
+      timer: setTimeout(() => {
+        spring.current = null;
+        if (paneDragSlot() === null) return;
+        onGroupsChange((g) =>
+          g.active === index || !g.groups[index] ? g : { ...g, active: index }
+        );
+      }, SPRING_MS),
+    };
+  };
+  // An overflowing bar has no scrollbar: near either end, a drag scrolls it.
+  const edgeScroll = (x: number) => {
+    const list = listRef.current;
+    if (!list || list.scrollWidth <= list.clientWidth) return;
+    const b = list.getBoundingClientRect();
+    if (x < b.left + EDGE_SCROLL_PX) list.scrollLeft -= 16;
+    else if (x > b.right - EDGE_SCROLL_PX) list.scrollLeft += 16;
+  };
   const endDrag = () => {
     dragged.current = [];
+    stopSpring();
     setDropAt(null);
     setJoinAt(null);
   };
@@ -266,6 +332,8 @@ export function ConsoleTabs({
       if (!isBarDrag(e)) return;
       e.preventDefault();
       e.dataTransfer.dropEffect = "move";
+      edgeScroll(e.clientX);
+      springAt(e);
       const join = joinIndexAt(e.clientX);
       const at = join === null ? dropIndexAt(e.clientX) : null;
       setJoinAt((d) => (d === join ? d : join));
@@ -273,6 +341,7 @@ export function ConsoleTabs({
     },
     onDragLeave: (e: DragEvent) => {
       if (e.currentTarget.contains(e.relatedTarget as Node | null)) return;
+      stopSpring();
       setDropAt(null);
       setJoinAt(null);
     },
@@ -504,10 +573,11 @@ export function ConsoleTabs({
               draggable
               onDragStart={(e) => {
                 dragged.current = tab.slots;
-                if (single) startPaneDrag(e, single.slot ?? 0);
+                if (single) startPaneDrag(e, single.slot ?? 0, label(single));
                 else {
                   e.dataTransfer?.setData(TAB_DRAG_TYPE, String(tab.index));
                   if (e.dataTransfer) e.dataTransfer.effectAllowed = "move";
+                  setDragChip(e, tabLabel(tab));
                 }
               }}
               onContextMenu={(e) => tabCtx.open(e, tab)}

client/src/components/run/PaneGrid.tsx

@@ -14,7 +14,13 @@
  * one tab's panes; `onChange` applies through `updateActive`, so a session
  * dropped or swapped in from another tab leaves that tab. A header names the pane's session and
  * shows its state dot, as its tab does.
- * Tabs from `ConsoleTabs` drag in the same way (`startPaneDrag`). A
+ * Tabs from `ConsoleTabs` drag in the same way (`startPaneDrag`). While a
+ * drag is on, the pane it carries is dimmed, the browser's ghost is a small
+ * chip with its name (`setDragChip`) instead of a whole header, and the drop
+ * preview names what the drop will do (`dropAction`). The dragged pane's
+ * header stays mounted even once the tab bar has switched tabs under the
+ * drag (`ConsoleTabs` spring-loads a hovered tab) — removing the drag's
+ * source node would lose its `dragend`. A
  * right-click on a header offers the swap, a split with a new terminal and
  * the close as one menu. Dividers resize by pointer or by arrow keys; a drag
  * moves only the line and commits the ratio on release, so the layout is
@@ -69,11 +75,31 @@ export const PANE_DRAG_TYPE = "application/x-agenthub-pane";
 /** The slot being dragged: `dataTransfer` data cannot be read during dragover. */
 let dragSlot: number | null = null;
 
-/** Starts dragging a pane or a tab (`slot`) onto the grid. */
-export function startPaneDrag(e: React.DragEvent, slot: number): void {
+/** The slot a pane drag carries, or null (no pane drag is on). */
+export const paneDragSlot = (): number | null => dragSlot;
+
+/** The drag's ghost: a small chip naming what moves, not a snapshot of a
+ *  whole pane header or tab. Drawn off screen for the browser to copy. */
+export function setDragChip(e: React.DragEvent, label: string): void {
+  const dt = e.dataTransfer;
+  if (!label || typeof dt?.setDragImage !== "function") return;
+  const chip = document.createElement("div");
+  chip.textContent = label;
+  chip.className =
+    "fixed -top-96 left-0 max-w-[16rem] truncate rounded-md border border-accent/60 bg-surface-2 px-2.5 py-1 text-xs font-medium text-fg-primary shadow-lg";
+  document.body.appendChild(chip);
+  dt.setDragImage(chip, 12, 12);
+  // The browser copies it during dragstart; it may go right after.
+  window.setTimeout(() => chip.remove(), 0);
+}
+
+/** Starts dragging a pane or a tab (`slot`) onto the grid; `label` names it
+ *  on the drag's chip. */
+export function startPaneDrag(e: React.DragEvent, slot: number, label?: string): void {
   dragSlot = slot;
   e.dataTransfer?.setData(PANE_DRAG_TYPE, String(slot));
   if (e.dataTransfer) e.dataTransfer.effectAllowed = "move";
+  if (label) setDragChip(e, label);
 }
 
 /** A run's icon: a shell's terminal glyph, else its AI tool's mark. */
@@ -140,6 +166,14 @@ export function dropPreview(l: PaneLayout, src: number, slot: number, zone: Zone
   return layoutRects(next.root).panes.find((p) => p.slot === src) ?? null;
 }
 
+/** What a drop does, as an i18n key (`lanes` namespace): the center swaps a
+ *  pane already shown, or shows one from another tab in the target's place
+ *  (the target gets a tab of its own); an edge places it on that side. */
+export function dropAction(l: PaneLayout, src: number, zone: Zone): string {
+  if (zone !== "center") return `panes.drop.${zone}`;
+  return leaves(l.root).includes(src) ? "panes.drop.swap" : "panes.drop.replace";
+}
+
 /** A small anchored menu: a trigger button and a list that closes on a pick,
  *  an outside click or Escape. */
 function PaneMenu({
@@ -398,6 +432,8 @@ export function PaneGrid({
   const { t } = useTranslation("lanes");
   const gridRef = useRef<HTMLDivElement>(null);
   const [drop, setDrop] = useState<{ src: number; slot: number; zone: Zone } | null>(null);
+  // The slot a pane drag carries (a header here, or a tab from the bar).
+  const [dragging, setDragging] = useState<number | null>(null);
   const { panes, dividers } = layoutRects(layout.root);
   const shown = leaves(layout.root);
   const rectOf = new Map(panes.map((p) => [p.slot, p]));
@@ -416,6 +452,7 @@ export function PaneGrid({
     const end = () => {
       dragSlot = null;
       setDrop(null);
+      setDragging(null);
     };
     window.addEventListener("dragend", end);
     window.addEventListener("drop", end);
@@ -479,6 +516,7 @@ export function PaneGrid({
         if (!isPaneDrag(e)) return;
         e.preventDefault();
         if (e.dataTransfer) e.dataTransfer.dropEffect = "move";
+        if (dragSlot !== dragging) setDragging(dragSlot);
         const z = zoneAt(e);
         const next = z && dragSlot !== null ? { src: dragSlot, ...z } : null;
         setDrop((d) =>
@@ -495,6 +533,7 @@ export function PaneGrid({
         const z = zoneAt(e);
         dragSlot = null;
         setDrop(null);
+        setDragging(null);
         if (!z || !Number.isInteger(src) || src === z.slot) return;
         onChange((l) => applyDrop(l, src, z.slot, z.zone));
       }}
@@ -515,6 +554,7 @@ export function PaneGrid({
         const r = rectOf.get(slot);
         const run = runOf(slot);
         const focused = layout.focus === slot;
+        const moving = dragging === slot;
         return (
           <div
             key={key}
@@ -522,17 +562,23 @@ export function PaneGrid({
             data-focused={r && focused ? "true" : undefined}
             // A menu opened in this pane stays inside it (`menuRoom`).
             data-menu-bounds
-            className={r ? "absolute flex flex-col" : "hidden"}
+            data-dragging={moving ? "true" : undefined}
+            className={r ? `absolute flex flex-col${moving ? " opacity-40" : ""}` : "hidden"}
             style={r ? pct(r) : undefined}
             onPointerDownCapture={() => r && focus(slot)}
             // Tabbing into a pane focuses it as a click does.
             onFocusCapture={() => r && focus(slot)}
           >
-            {multi && r && (
+            {/* The dragged pane's header stays while the drag lasts, even
+                hidden in another tab: it is the drag's source node. */}
+            {((multi && r) || moving) && (
               <div
                 data-testid={`pane-header-${slot}`}
                 draggable
-                onDragStart={(e) => startPaneDrag(e, slot)}
+                onDragStart={(e) => {
+                  startPaneDrag(e, slot, run ? label(run) : t("panes.empty"));
+                  setDragging(slot);
+                }}
                 onContextMenu={(e) => paneCtx.open(e, slot)}
                 title={t("panes.drag")}
                 className={`relative flex h-8 shrink-0 cursor-grab items-center gap-1 border-b border-border bg-surface-1 pl-1.5 pr-1 text-xs ${
@@ -667,12 +713,19 @@ export function PaneGrid({
           }
         />
       ))}
-      {preview && (
+      {preview && drop && (
         <div
           data-testid="pane-drop-preview"
-          className="pointer-events-none absolute z-20 rounded-md border-2 border-accent/60 bg-accent/15 transition-all duration-100"
+          className="pointer-events-none absolute z-20 flex items-center justify-center rounded-md border-2 border-accent/60 bg-accent/15 transition-all duration-100"
           style={pct(preview)}
-        />
+        >
+          <span
+            data-testid="pane-drop-label"
+            className="max-w-[90%] truncate rounded-md bg-accent-solid px-2.5 py-1 text-xs font-medium text-white shadow-lg"
+          >
+            {t(dropAction(layout, drop.src, drop.zone))}
+          </span>
+        </div>
       )}
     </div>
   );

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

@@ -0,0 +1,126 @@
+/**
+ * @file ConsoleTabs.test.tsx
+ * @description The tab bar's spring-loaded tabs: a pane drag resting on
+ * another tab shows it after `SPRING_MS`, so the pane can be dropped on that
+ * tab's panes; moving off before then, or resting on the tab already holding
+ * the pane, shows nothing.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { act, createEvent, fireEvent, render, screen } from "@testing-library/react";
+import { MemoryRouter } from "react-router-dom";
+import type { RunHandle } from "../../../lib/api";
+import type { Lane } from "../../../lib/types";
+import { pane, split, type PaneGroups } from "../../../lib/paneLayout";
+import { ConsoleTabs, SPRING_MS } from "../ConsoleTabs";
+import { PANE_DRAG_TYPE, paneDragSlot } from "../PaneGrid";
+
+vi.mock("../../../lib/api", () => ({
+  api: {
+    aiTools: {
+      list: vi.fn().mockResolvedValue({ default: "claude", tools: [] }),
+      models: vi.fn().mockResolvedValue({ flag: true, models: [], defaultModel: null }),
+    },
+  },
+}));
+
+const LANE = { id: 1, tool: "claude", cwd: "/w", title: "w" } as unknown as Lane;
+const run = (slot: number): RunHandle => ({
+  id: slot ? `agenthub-lane-1-${slot}` : "agenthub-lane-1",
+  laneId: 1,
+  slot,
+  status: "running",
+  cwd: "/w",
+  model: null,
+  permissionMode: null,
+  effort: null,
+  resumeSessionId: null,
+  sessionId: null,
+  startedAt: null,
+  promptPreview: null,
+  tool: "shell",
+});
+// Tab 0: pane 0 alone (on screen); tab 1: panes 1 and 2.
+const GROUPS: PaneGroups = {
+  groups: [
+    { root: pane(0), focus: 0 },
+    { root: split("row", pane(1), pane(2)), focus: 1 },
+  ],
+  active: 0,
+};
+
+function setup() {
+  let groups = GROUPS;
+  const onGroupsChange = vi.fn((fn: (g: PaneGroups) => PaneGroups) => {
+    groups = fn(groups);
+  });
+  render(
+    <MemoryRouter>
+      <ConsoleTabs
+        lane={LANE}
+        tabs={[run(0), run(1), run(2)]}
+        groups={GROUPS}
+        onGroupsChange={onGroupsChange}
+        onOpen={vi.fn()}
+        onClosed={vi.fn()}
+      />
+    </MemoryRouter>
+  );
+  // jsdom lays nothing out: tab i spans x 100i … 100i+100.
+  for (const el of document.querySelectorAll<HTMLElement>("[data-tab-index]")) {
+    const i = Number(el.dataset.tabIndex);
+    el.getBoundingClientRect = () =>
+      ({
+        left: i * 100,
+        right: i * 100 + 100,
+        width: 100,
+        top: 0,
+        bottom: 40,
+        height: 40,
+      }) as DOMRect;
+  }
+  return { onGroupsChange, groups: () => groups };
+}
+
+const dataTransfer = () => ({
+  types: [PANE_DRAG_TYPE],
+  setData: vi.fn(),
+  getData: () => "",
+  effectAllowed: "",
+  dropEffect: "",
+});
+
+function drag(type: "dragStart" | "dragOver", el: Element, clientX = 0) {
+  const ev = createEvent[type](el, { dataTransfer: dataTransfer() });
+  Object.defineProperty(ev, "clientX", { value: clientX });
+  fireEvent(el, ev);
+}
+
+const tabEl = (key: string) => screen.getByTestId(`console-tab-${key}`).parentElement as Element;
+
+describe("ConsoleTabs spring-loaded tabs", () => {
+  beforeEach(() => vi.useFakeTimers());
+  afterEach(() => vi.useRealTimers());
+
+  it("a pane drag resting on another tab shows that tab", () => {
+    const { onGroupsChange, groups } = setup();
+    drag("dragStart", tabEl("0"));
+    expect(paneDragSlot()).toBe(0);
+    drag("dragOver", tabEl("1-2"), 150);
+    act(() => void vi.advanceTimersByTime(SPRING_MS - 1));
+    expect(onGroupsChange).not.toHaveBeenCalled();
+    act(() => void vi.advanceTimersByTime(1));
+    expect(groups().active).toBe(1);
+  });
+
+  it("moving off the tab first, or resting on the pane's own tab, shows nothing", () => {
+    const { onGroupsChange } = setup();
+    drag("dragStart", tabEl("0"));
+    drag("dragOver", tabEl("1-2"), 150);
+    act(() => void vi.advanceTimersByTime(SPRING_MS / 2));
+    drag("dragOver", tabEl("0"), 50);
+    act(() => void vi.advanceTimersByTime(SPRING_MS * 2));
+    expect(onGroupsChange).not.toHaveBeenCalled();
+  });
+});

client/src/components/run/__tests__/PaneGrid.test.ts

@@ -2,12 +2,13 @@
  * @file PaneGrid.test.ts
  * @description The pane drop preview: it draws where the dragged pane will
  * actually land (`dropPreview` over `applyDrop`), not half of the target's
- * current box, and nothing for a drop that changes nothing.
+ * current box, and nothing for a drop that changes nothing; and the label
+ * naming what a drop does (`dropAction`).
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
 import { describe, expect, it } from "vitest";
-import { dropPreview } from "../PaneGrid";
+import { dropAction, dropPreview } from "../PaneGrid";
 import { pane, split, type PaneLayout } from "../../../lib/paneLayout";
 
 const AB: PaneLayout = { root: split("row", pane(0), pane(1)), focus: 0 };
@@ -34,3 +35,15 @@ describe("dropPreview", () => {
     expect(dropPreview(full, 5, 0, "left")).toBeNull();
   });
 });
+
+describe("dropAction", () => {
+  it("an edge places the pane on that side", () => {
+    expect(dropAction(AB, 0, "left")).toBe("panes.drop.left");
+    expect(dropAction(AB, 2, "bottom")).toBe("panes.drop.bottom");
+  });
+
+  it("the center swaps a shown pane, or shows one from another tab in its place", () => {
+    expect(dropAction(AB, 0, "center")).toBe("panes.drop.swap");
+    expect(dropAction(AB, 2, "center")).toBe("panes.drop.replace");
+  });
+});