Add Apple Pencil support, reading plan, full-text search, and inline ink

- Apple Pencil hover cursor: previews brush size/shape before contact
- Tilt shading: tilted pen strokes widen and reduce thinning via tiltX/Y
- Two-finger undo in draw mode (non-stylus two-finger tap)
- Copy & open Claude buttons: copies study/podcast prompt then opens claude.ai/new
- Inline ink canvas in study notes (DrawCanvas embedded in Notes tab)
- Full-text search across all project notes with 300ms debounce
- Reading plan: set a book + week goal, mark chapters read from the reader

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/launch.json

@@ -8,6 +8,13 @@
       "port": 5173,
       "autoPort": false
     },
+    {
+      "name": "study-app-alt",
+      "runtimeExecutable": "npm",
+      "runtimeArgs": ["run", "dev", "--", "--port", "5174"],
+      "port": 5174,
+      "autoPort": false
+    },
     {
       "name": "study-app-server",
       "runtimeExecutable": "npm",