tim plugin, chat bot sync notifications, test fixes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/plugins/tests/undo.test.js

@@ -357,7 +357,15 @@ describe('Undo: No-Op When Empty', () => {
             ctrlZ();
             await sleep(200);
         }
-        // Now Ctrl+Z should be harmless
+        // Wait for state to settle — previous undo operations can still be
+        // resurrecting cards asynchronously after canUndo() has flipped to
+        // false. Poll until two consecutive fetches agree on card count.
+        let prev = -1, stable = 0;
+        for (let i = 0; i < 30 && stable < 2; i++) {
+            const cards = await fetch('api/cards').then(r => r.json());
+            if (cards.length === prev) stable++; else { stable = 0; prev = cards.length; }
+            if (stable < 2) await sleep(100);
+        }
         const cardsBefore = await fetch('api/cards').then(r => r.json());
         ctrlZ();
         await sleep(200);