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/json-schema-traverse/spec/.eslintrc.yml

@@ -0,0 +1,6 @@
+parserOptions:
+  ecmaVersion: 6
+globals:
+  beforeEach: false
+  describe: false
+  it: false