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/shared/stdio.d.ts.map

@@ -0,0 +1 @@
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