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.8cbb6a93.svg

@@ -0,0 +1,4 @@
+<svg viewBox="0 0 24 24" 
+  xmlns="http://www.w3.org/2000/svg">
+  <path fill-rule="evenodd" clip-rule="evenodd" d="M23.3327 2.54004C24.1705 3.30678 24.227 4.60642 23.4591 5.44287L9.78844 20.3338C9.3987 20.7583 8.8484 21 8.27163 21C7.69485 21 7.14456 20.7583 6.75481 20.3338L0.540861 13.5652C-0.227044 12.7287 -0.170453 11.4291 0.667261 10.6624C1.50497 9.89561 2.80659 9.95212 3.57449 10.7886L8.27163 15.9049L20.4255 2.66625C21.1934 1.82981 22.495 1.7733 23.3327 2.54004Z"/>
+</svg>