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/vocabularies/validation/uniqueItems.d.ts

@@ -0,0 +1,9 @@
+import type { CodeKeywordDefinition, ErrorObject } from "../../types";
+export type UniqueItemsError = ErrorObject<"uniqueItems", {
+    i: number;
+    j: number;
+}, boolean | {
+    $data: string;
+}>;
+declare const def: CodeKeywordDefinition;
+export default def;