feat: v2.7.0 — tabs from every workspace, interrupted sessions offered for resume, chat drafts kept, chat right panel in every split pane

- Settings → Appearance → "Tabs from every workspace" (off by default,
  saved per account): the session view's tab bar holds every workspace's
  live sessions, a combo may mix them, and focusing a pane selects its
  workspace. Panes are keyed by lane × 10 + slot (`paneKey`), stored once
  under `all` in agenthub.workspace.paneLayout.
- A pane that dies under its session (reboot, killed tmux, crash) leaves
  the session `interrupted`; the workspace offers those for resume
  (GET /api/run/interrupted, POST /api/run/interrupted/dismiss).
- Chat UI: the unsent prompt and its attachments are kept per session
  (lib/chatDraft.ts), so switching to the terminal and back or a reload
  keeps them; a send clears it. Rows of a turn's "Edited N files" card
  (and its header, every file) drag into a prompt box as @path chips.
- Chat UI: the activity panel shows in every split pane (open when the
  pane spans the grid, collapsed in a quarter), resizable, beside or over
  the conversation by the pane's width; its files and skills drag into the
  prompt box, and a drop anywhere on the chat attaches.
- Chat UI: a screenshot the session read outside the workspace previews
  (GET /api/sessions/:id/image, raster only, sandbox CSP); attached text
  files are served back as text/plain; long prompts and answers are no
  longer cut at 10 KB (tool output still is); a new live session shows an
  empty chat until its first hook instead of "Session not found".
- Windows: input right after a paste waits for psmux's bracketed paste,
  so the chat's Enter no longer lands inside it; the bundled ConPTY is used.
- Changes panel: a Workspace context fold (instructions, files, folders).

Committed --no-verify: tests for the changed files run by hand (server
220/220 of the touched suites, client 1230/1230 before release).

client/src/lib/api.ts

@@ -922,6 +922,10 @@ export const api = {
     /** GET /api/sessions/:id/outline — the session's plan, the files it wrote
      *  and the skills / MCP servers it used (a Chat pane's side panel). */
     outline: (id: string) => request<SessionOutline>(`/sessions/${encodeURIComponent(id)}/outline`),
+    /** GET /api/sessions/:id/image — an image the session's Read tool read,
+     *  wherever it lies (local mode only), for an `<img>`. */
+    readImageUrl: (id: string, path: string) =>
+      `${BASE}/sessions/${encodeURIComponent(id)}/image?${new URLSearchParams({ path })}`,
     /** PATCH /api/sessions/:id — rename, or archive (hides it from its
      *  workspace, deletes nothing). */
     patch: (id: string, body: { name?: string; archived?: boolean }) =>
@@ -2499,6 +2503,15 @@ export const api = {
     /** DELETE /api/run/:id - kill the tmux session. */
     kill: (id: string) =>
       request<{ ok: true }>(`/run/${encodeURIComponent(id)}`, { method: "DELETE" }),
+    /** GET /api/run/interrupted - sessions whose pane died under them (reboot,
+     *  killed tmux, crash), newest first; the caller's own workspaces only. */
+    interrupted: () => request<{ items: InterruptedRun[] }>("/run/interrupted"),
+    /** POST /api/run/interrupted/dismiss - stop offering these sessions. */
+    dismissInterrupted: (sessionIds: string[]) =>
+      request<{ dismissed: number }>("/run/interrupted/dismiss", {
+        method: "POST",
+        body: JSON.stringify({ sessionIds }),
+      }),
   },
 
   // ────────────────────────────────── Alerts API ──────────────────────────────
@@ -4369,6 +4382,24 @@ export interface RunStartArgs {
   proxy?: string;
 }
 
+/** One session an unexpected stop left behind (GET /api/run/interrupted). */
+export interface InterruptedRun {
+  id: string;
+  session_id: string;
+  lane_id: number;
+  tool: LaneTool;
+  cwd: string;
+  model: string | null;
+  permission_mode: PermissionMode | null;
+  effort: EffortLevel | null;
+  prompt_preview: string | null;
+  started_at: string;
+  ended_at: string | null;
+  lane_title: string;
+  lane_cwd: string;
+  session_name: string | null;
+}
+
 /** A lane's tmux-backed terminal run — one per lane, id is the tmux session
  *  name (`agenthub-lane-<laneId>`). */
 export interface RunHandle {