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/fast-uri/.github/tests_checker.yml

@@ -0,0 +1,8 @@
+comment: |
+  Hello! Thank you for contributing!
+  It appears that you have changed the code, but the tests that verify your change are missing. Could you please add them?
+fileExtensions:
+  - '.ts'
+  - '.js'
+
+testDir: 'test'