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-to-json-schema/dist/esm/parsers/enum.js

@@ -0,0 +1,6 @@
+export function parseEnumDef(def) {
+    return {
+        type: "string",
+        enum: Array.from(def.values),
+    };
+}