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/dist/runtime/parseJson.d.ts

@@ -0,0 +1,18 @@
+export declare function parseJson(s: string, pos: number): unknown;
+export declare namespace parseJson {
+    var message: string | undefined;
+    var position: number;
+    var code: string;
+}
+export declare function parseJsonNumber(s: string, pos: number, maxDigits?: number): number | undefined;
+export declare namespace parseJsonNumber {
+    var message: string | undefined;
+    var position: number;
+    var code: string;
+}
+export declare function parseJsonString(s: string, pos: number): string | undefined;
+export declare namespace parseJsonString {
+    var message: string | undefined;
+    var position: number;
+    var code: string;
+}