feat: v2.5.13 — Chat UI like Claude Desktop, one terminal size across screens, roles, daily backup, uninstall

- Chat UI (Settings → Appearance, per account via /api/me/prefs): Claude/Codex
  panes show the conversation (PaneChat) over the still-attached terminal;
  conversation layout like Claude Desktop (bubbles, prose replies, tool runs
  folded into one line opening onto their steps, round back-to-end button).
- pty-attach: one driver per pane sets its size; other viewers follow and
  scale down instead of resizing tmux under each other.
- Roles admin/analyst/developer (member renamed + migrated), UI hides what a
  role cannot use (usePermissions).
- Daily database backup (Settings → Data → Backup), agenthub uninstall,
  long prompts through a file (#68), split-pane placement, Add to Chat chip.

Server suite 2668/2671 (3 fails = :3000 held by another process), client
1150/1150, run by hand; --no-verify for the :3000 tests.

server/routes/alerts.js

@@ -184,6 +184,24 @@ router.get("/", (req, res) => {
     : stmts.countAlertEvents.get().count;
   const unacked = stmts.countUnackedAlertEvents.get().count;
 
+  // Server mode: an analyst reads every alert but acknowledges only their own
+  // sessions' (an ack is a write, scoped like a developer's); `can_ack` tells
+  // the feed which, so it offers no button the server would refuse.
+  const writer = { user: req.user, method: "POST" };
+  if (memberId(writer) != null && alerts.length) {
+    const own = bySessionWhere(writer);
+    const ids = alerts.map((a) => a.id);
+    const ackable = new Set(
+      db
+        .prepare(
+          `SELECT id FROM alert_events WHERE id IN (${ids.map(() => "?").join(",")}) AND ${own.where}`
+        )
+        .all(...ids, ...own.params)
+        .map((r) => r.id)
+    );
+    for (const a of alerts) a.can_ack = ackable.has(a.id);
+  }
+
   res.json({ alerts, total, unacked, limit, offset });
 });