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/jose/dist/webapi/lib/sign.js

@@ -0,0 +1,9 @@
+import { subtleAlgorithm } from './subtle_dsa.js';
+import { checkKeyLength } from './check_key_length.js';
+import { getSigKey } from './get_sign_verify_key.js';
+export async function sign(alg, key, data) {
+    const cryptoKey = await getSigKey(alg, key, 'sign');
+    checkKeyLength(alg, cryptoKey);
+    const signature = await crypto.subtle.sign(subtleAlgorithm(alg, cryptoKey.algorithm), cryptoKey, data);
+    return new Uint8Array(signature);
+}