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/es-object-atoms/ToObject.d.ts

@@ -0,0 +1,7 @@
+declare function ToObject<T extends object>(value: number): Number;
+declare function ToObject<T extends object>(value: boolean): Boolean;
+declare function ToObject<T extends object>(value: string): String;
+declare function ToObject<T extends object>(value: bigint): BigInt;
+declare function ToObject<T extends object>(value: T): T;
+
+export = ToObject;