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/@modelcontextprotocol/sdk/dist/esm/experimental/index.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../../../src/experimental/index.ts"],"names":[],"mappings":"AAAA;;;;;;;;;;GAUG;AAEH,cAAc,kBAAkB,CAAC"}