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/express-rate-limit/tsconfig.json

@@ -0,0 +1,8 @@
+{
+	"include": ["source/"],
+	"exclude": ["node_modules/"],
+	"extends": "@express-rate-limit/tsconfig",
+	"compilerOptions": {
+		"target": "ES2020"
+	}
+}