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/ajv/lib/runtime/re2.ts

@@ -0,0 +1,6 @@
+import * as re2 from "re2"
+
+type Re2 = typeof re2 & {code: string}
+;(re2 as Re2).code = 'require("ajv/dist/runtime/re2").default'
+
+export default re2 as Re2