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/@hono/node-server/dist/utils.d.ts

@@ -0,0 +1,9 @@
+import { OutgoingHttpHeaders } from 'node:http';
+import { Writable } from 'node:stream';
+
+declare function readWithoutBlocking(readPromise: Promise<ReadableStreamReadResult<Uint8Array>>): Promise<ReadableStreamReadResult<Uint8Array> | undefined>;
+declare function writeFromReadableStreamDefaultReader(reader: ReadableStreamDefaultReader<Uint8Array>, writable: Writable, currentReadPromise?: Promise<ReadableStreamReadResult<Uint8Array>> | undefined): Promise<undefined>;
+declare function writeFromReadableStream(stream: ReadableStream<Uint8Array>, writable: Writable): Promise<undefined> | undefined;
+declare const buildOutgoingHttpHeaders: (headers: Headers | HeadersInit | null | undefined) => OutgoingHttpHeaders;
+
+export { buildOutgoingHttpHeaders, readWithoutBlocking, writeFromReadableStream, writeFromReadableStreamDefaultReader };