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/mime/cli.js

@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+
+var mime = require('./mime.js');
+var file = process.argv[2];
+var type = mime.lookup(file);
+
+process.stdout.write(type + '\n');
+