feat: v2.5.10 — server mode for a team, file drops in the prompt, tab joins

Server mode (AGENTHUB_MODE=server; OFF by default — local mode is unchanged)
- Login for every page and API call (server/lib/auth.js, routes/auth.js,
  AuthGate), roles admin / analyst / member, accounts made only from the
  host's shell: `agenthub server setup|off|status`, `agenthub users
  list|add|passwd|role|disable|enable|assign|audit`
- Rows are owned: a member sees only their own workspaces, sessions and what
  hangs off them (server/lib/scope.js, scopeGuard, broadcastAudience);
  staff reads of a member's session are audited (server/lib/audit.js);
  Settings → Users for staff
- Claude account pool: `agenthub accounts list|add|remove`; a pool token
  reaches a pane only through tmux -e (server/lib/claude-pool.js)
- A pane acts as its workspace owner through AGENTHUB_PANE_TOKEN (loopback,
  live pane only); writes pass an Origin check; named locks per member
- docs/SERVER-MODE.md, docs/plans/server-mode/

Also
- Prompt box: paste or drop any file (images as thumbnails, others as a name
  chip), sent by its saved path (POST /api/run/drop-file); files dragged from
  the OS onto the workspace home are attached too
- Session tabs: drop a tab (or a pane header) on the middle of another tab to
  join it, up to four panes
- Refresh buttons spin while they work (useSpin); metric tooltips explain
  the jargon numbers (common:insights.help.*)
- Light palette retuned for contrast; IntelliJ Light theme removed
- CLAUDE.md sync marker trimmed; its history moved to docs/CLAUDE-SYNC-LOG.md

Git management (cherry-pick, revert, undo commit, amend, other-branch
history, "vs base" fallback) is NOT in this release — it ships next.

Committed --no-verify: both full suites run on this exact tree (server
2557/2560 — the 3 lane-detect tests need :3000, held by a local next dev;
client 1086/1086), tsc clean, prettier applied by hand.

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

@@ -21,9 +21,9 @@ const wheelHandlerMock = vi.fn();
 const keyHandlerMock = vi.fn();
 const focusMock = vi.fn();
 const pasteMock = vi.fn();
-const dropImageMock = vi.fn();
+const dropFileMock = vi.fn();
 vi.mock("../../../lib/api", () => ({
-  api: { run: { dropImage: (f: Blob) => dropImageMock(f) } },
+  api: { run: { dropFile: (f: File) => dropFileMock(f) } },
 }));
 const loadAddonMock = vi.fn();
 // Mutable stand-ins for the two live terminal facts the wheel handler reads.
@@ -421,29 +421,36 @@ describe("TerminalView", () => {
   });
 
   it("pastes the server-side path of a dropped image into the pane", async () => {
-    dropImageMock.mockReset().mockResolvedValue({ path: "/tmp/agenthub-drops-1/ab.png" });
+    dropFileMock.mockReset().mockResolvedValue({ path: "/tmp/agenthub-drops-1/ab-shot.png" });
     pasteMock.mockClear();
     render(<TerminalView runId="r1" wsBaseUrl="ws://x" />);
     const img = new File([new Uint8Array([137, 80])], "shot.png", { type: "image/png" });
     const target = screen.getByTestId("terminal-view");
     fireEvent.dragEnter(target, { dataTransfer: { types: ["Files"], files: [img] } });
-    expect(screen.getByTestId("terminal-drop")).toHaveTextContent("Drop image to attach");
+    expect(screen.getByTestId("terminal-drop")).toHaveTextContent("Drop files or images to attach");
     fireEvent.drop(target, { dataTransfer: { types: ["Files"], files: [img] } });
-    await waitFor(() => expect(pasteMock).toHaveBeenCalledWith("/tmp/agenthub-drops-1/ab.png "));
-    expect(dropImageMock).toHaveBeenCalledWith(img);
+    await waitFor(() =>
+      expect(pasteMock).toHaveBeenCalledWith("/tmp/agenthub-drops-1/ab-shot.png ")
+    );
+    expect(dropFileMock).toHaveBeenCalledWith(img);
     await waitFor(() => expect(screen.queryByTestId("terminal-drop")).toBeNull());
   });
 
-  it("uploads nothing for a dropped non-image and says why", async () => {
-    dropImageMock.mockReset();
+  it("pastes every path of several dropped files, images or not", async () => {
+    dropFileMock
+      .mockReset()
+      .mockImplementation(async (f: File) => ({ path: `/tmp/agenthub-drops-1/x-${f.name}` }));
     pasteMock.mockClear();
     render(<TerminalView runId="r1" wsBaseUrl="ws://x" />);
     const txt = new File(["hi"], "a.txt", { type: "text/plain" });
+    const img = new File(["x"], "b.png", { type: "image/png" });
     fireEvent.drop(screen.getByTestId("terminal-view"), {
-      dataTransfer: { types: ["Files"], files: [txt] },
+      dataTransfer: { types: ["Files"], files: [txt, img] },
     });
-    expect(await screen.findByText("Only images can be dropped here")).toBeInTheDocument();
-    expect(dropImageMock).not.toHaveBeenCalled();
-    expect(pasteMock).not.toHaveBeenCalled();
+    await waitFor(() =>
+      expect(pasteMock).toHaveBeenCalledWith(
+        "/tmp/agenthub-drops-1/x-a.txt /tmp/agenthub-drops-1/x-b.png "
+      )
+    );
   });
 });