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/zod/v3/helpers/errorUtil.cjs

@@ -0,0 +1,9 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.errorUtil = void 0;
+var errorUtil;
+(function (errorUtil) {
+    errorUtil.errToObj = (message) => typeof message === "string" ? { message } : message || {};
+    // biome-ignore lint:
+    errorUtil.toString = (message) => typeof message === "string" ? message : message?.message;
+})(errorUtil || (exports.errorUtil = errorUtil = {}));