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/compile/validate/boolSchema.d.ts

@@ -0,0 +1,4 @@
+import type { SchemaCxt } from "..";
+import { Name } from "../codegen";
+export declare function topBoolOrEmptySchema(it: SchemaCxt): void;
+export declare function boolOrEmptySchema(it: SchemaCxt, valid: Name): void;