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).

server/__tests__/dashboard-runs.test.js

@@ -86,6 +86,53 @@ describe("dashboard-runs", () => {
     assert.equal(runs.getRun("agenthub-lane-6").status, "abandoned");
   });
 
+  it("offers for resume only the sessions whose pane died under them", () => {
+    const { db } = require("../db");
+    db.prepare("INSERT INTO lanes (id, title, cwd) VALUES (20, 'w', '/i')").run();
+    const session = db.prepare(
+      "INSERT INTO sessions (id, name, status, cwd) VALUES (?, ?, 'active', '/i')"
+    );
+    for (const id of ["s-boot", "s-exit", "s-signal", "s-codex"]) session.run(id, id);
+    const end = db.prepare(
+      "INSERT INTO events (session_id, event_type, data) VALUES (?, 'SessionEnd', ?)"
+    );
+    end.run("s-exit", JSON.stringify({ reason: "prompt_input_exit" }));
+    end.run("s-signal", JSON.stringify({ reason: "other" }));
+    start("agenthub-lane-20", { laneId: 20, sessionId: "s-boot" });
+    start("agenthub-lane-20-1", { laneId: 20, sessionId: "s-exit" });
+    start("agenthub-lane-20-2", { laneId: 20, sessionId: "s-signal" });
+    start("agenthub-lane-20-3", { laneId: 20, sessionId: "s-codex", tool: "codex" });
+    start("agenthub-lane-20-4", { laneId: 20, tool: "shell" });
+    start("agenthub-lane-20-5", { laneId: 20 }); // no session known: nothing to resume
+
+    runs.reconcileOrphans((id) => !id.startsWith("agenthub-lane-20"));
+    const status = (id) => runs.getRun(id).status;
+    assert.equal(status("agenthub-lane-20"), "interrupted");
+    assert.equal(status("agenthub-lane-20-1"), "abandoned", "the user's own /exit");
+    assert.equal(status("agenthub-lane-20-2"), "interrupted", "a signal is not the user");
+    assert.equal(status("agenthub-lane-20-3"), "interrupted");
+    assert.equal(status("agenthub-lane-20-5"), "abandoned");
+    const offered = () =>
+      runs
+        .listInterrupted()
+        .map((r) => r.session_id)
+        .sort();
+    assert.deepEqual(offered(), ["s-boot", "s-codex", "s-signal"]);
+    assert.deepEqual(runs.listInterrupted(99), [], "another owner's workspace");
+
+    // Resumed by any path: a newer run of the session takes it off the list.
+    start("agenthub-lane-20-6", {
+      laneId: 20,
+      sessionId: "s-signal",
+      startedAt: Date.now() + 1000,
+    });
+    assert.deepEqual(offered(), ["s-boot", "s-codex"]);
+
+    assert.equal(runs.dismissInterrupted(["s-boot"], 99), 0, "not the caller's");
+    assert.equal(runs.dismissInterrupted(["s-boot", "s-codex"]), 2);
+    assert.deepEqual(offered(), []);
+  });
+
   it("gives a hookless tool's session the lane of the run it started in", () => {
     const { db } = require("../db");
     start("agenthub-lane-7-1", {