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/dist/middleware/powered-by/index.js

@@ -0,0 +1,10 @@
+// src/middleware/powered-by/index.ts
+var poweredBy = (options) => {
+  return async function poweredBy2(c, next) {
+    await next();
+    c.res.headers.set("X-Powered-By", options?.serverName ?? "Hono");
+  };
+};
+export {
+  poweredBy
+};