feat(approvals): let a watching session keep quiet, and fix the tui gate

The badge alone left the row in NEEDS YOU, which is the thing the issue was
about. The fix is the alert that does not fire.

An idle prompt from a session that is watching its own background work now
opens ALREADY acknowledged. `hook-event-routes` passes `Session.watching` to
`notePrompt()`, which sets `acknowledgedAt` and records why in a new
`acknowledgedReason`. Nothing new suppresses anything: `acknowledge()` has
always meant "the alert this prompt armed is spent", and the prompt itself
stays pending, answerable and available as Read My Mind context. A wrong label
therefore costs a card that does not blink, never an alert that was never
created.

Every surface follows from that. The broadcast carries the reason, so a live
page declines to arm the tab alert and raises no desktop notification. The push
is skipped, since a false alarm is hardest to ignore on a phone. A reloading
page reads `acknowledgedAt` in `seedApprovals()`, which it already did. And
`classifySession()` now reads it too, which is a pre-existing bug fixed here:
acknowledging on one device cleared the alert everywhere except `codeman tui`.
It re-arms for free, because the next idle prompt supersedes the item and is
built fresh. Only `idle` is eligible, so a dialog that blocks the agent still
goes red whatever else it started.

The label is pane-derived and therefore prompt-injectable, so it is now read
from the last two rows of the screen only, with Claude's pattern anchored on
the `·` its footer joins items with, ANSI-stripped and length-capped at the
source. An agent that prints `· 1 monitor ·` into its own output finds no
match.

Verified on an isolated beta: a session that armed a monitor took its idle
prompt acknowledged with no alert on any surface, wore the badge, and showed
"quiet, watching 1 monitor" on its still-answerable card; the same session with
the monitor killed alerted normally on the next prompt. `test/watching-no-alert.test.ts`
pins both directions across all four surfaces.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

test/routes/approval-routes.test.ts

@@ -325,6 +325,65 @@ describe('approval routes', () => {
     });
   });
 
+  describe('an idle prompt from a session watching its own background work', () => {
+    beforeEach(() => {
+      session.terminalBuffer = 'claude> waiting at the composer';
+      session.watching = '1 monitor';
+    });
+
+    it('opens acknowledged, so no surface has an alert to raise', async () => {
+      await postHook(harness, 'idle_prompt', { message: 'Claude is waiting for your input' });
+      const [item] = await listApprovals(harness);
+      expect(item).toMatchObject({ kind: 'idle', acknowledgedReason: 'watching 1 monitor' });
+      expect(item.acknowledgedAt).toEqual(expect.any(Number));
+    });
+
+    it('tells a live page why, so it declines to arm the alert', async () => {
+      await postHook(harness, 'idle_prompt', {});
+      const broadcast = harness.ctx.broadcast.mock.calls.find((c) => c[0] === 'hook:idle_prompt');
+      expect(broadcast?.[1]).toMatchObject({ acknowledgedReason: 'watching 1 monitor' });
+    });
+
+    it('sends no push', async () => {
+      // The loudest surface, and the one a false alarm is hardest to ignore on.
+      await postHook(harness, 'idle_prompt', {});
+      expect(harness.ctx.sendPushNotifications.mock.calls.find((c) => c[0] === 'hook:idle_prompt')).toBeUndefined();
+    });
+
+    it('stays answerable from the drawer', async () => {
+      await postHook(harness, 'idle_prompt', {});
+      const [item] = await listApprovals(harness);
+      const res = await harness.app.inject({
+        method: 'POST',
+        url: `/api/approvals/${item.id}/answer`,
+        payload: { action: 'text', text: 'carry on' },
+      });
+      expect(res.statusCode).toBe(200);
+      expect(session.writeBuffer.join('')).toContain('carry on');
+    });
+
+    it('still raises a permission dialog from the same session', async () => {
+      // Watching says nothing about a dialog: that one blocks the agent outright.
+      session.terminalBuffer = PERMISSION_DIALOG;
+      await postHook(harness, 'permission_prompt', { tool_name: 'Bash' });
+      const [item] = await listApprovals(harness);
+      expect(item.acknowledgedAt).toBeUndefined();
+      expect(item.acknowledgedReason).toBeUndefined();
+      const broadcast = harness.ctx.broadcast.mock.calls.find((c) => c[0] === 'hook:permission_prompt');
+      expect(broadcast?.[1]).not.toMatchObject({ acknowledgedReason: expect.any(String) });
+      expect(harness.ctx.sendPushNotifications.mock.calls.find((c) => c[0] === 'hook:permission_prompt')).toBeDefined();
+    });
+
+    it('alerts normally again once the background work is over', async () => {
+      await postHook(harness, 'idle_prompt', {});
+      session.watching = null;
+      await postHook(harness, 'idle_prompt', {});
+      const [item] = await listApprovals(harness);
+      expect(item.acknowledgedAt).toBeUndefined();
+      expect(harness.ctx.sendPushNotifications.mock.calls.filter((c) => c[0] === 'hook:idle_prompt')).toHaveLength(1);
+    });
+  });
+
   it('viewing a session acknowledges its idle prompt (item stays pending) and broadcasts it', async () => {
     session.terminalBuffer = 'claude> waiting at the composer';
     await postHook(harness, 'idle_prompt', {});