tim plugin, chat bot sync notifications, test fixes

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

public/plugins/tests/tests.js

@@ -39,6 +39,7 @@ const FILES = [
     './editor-toolbar.test.js',
     './line-numbers.test.js',
     './canvas.test.js',
+    './tim.test.js',
     './snippets.test.js',
     './image-fullscreen.test.js',
     './markdown.test.js',