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/enum.7ec0b64c.svg

@@ -0,0 +1,6 @@
+<svg viewBox="0 0 24 24" 
+  xmlns="http://www.w3.org/2000/svg">
+  <path fill-rule="evenodd" clip-rule="evenodd" d="M24 4.8H0V0H24V4.8Z" />
+  <path fill-rule="evenodd" clip-rule="evenodd" d="M16.8 14.4H0V9.60001H16.8V14.4Z" />
+  <path fill-rule="evenodd" clip-rule="evenodd" d="M24 24H0V19.2H24V24Z" />
+</svg>