fix: Add debounced Undo/Redo system to avoid character-by-character history

- Add debounced state updates for title and content (500ms delay)
- Immediate UI updates with delayed history saving
- Prevent one-letter-per-undo issue
- Add cleanup for debounce timers on unmount

mcp-server/node_modules/prisma/build/public/assets/ellipsis.a8c5a34a.svg

@@ -0,0 +1,10 @@
+<svg
+  viewBox="0 0 24 24"
+  xmlns="http://www.w3.org/2000/svg"
+>
+  <g>
+    <circle cx="6" cy="12" r="2" />
+    <circle cx="12" cy="12" r="2" />
+    <circle cx="18" cy="12" r="2" />
+  </g>
+</svg>