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/tick-indeterminate.aec8a44d.svg

@@ -0,0 +1,3 @@
+<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
+<rect fill-rule="evenodd" clip-rule="evenodd" y="10" width="24" height="4" rx="2"/>
+</svg>