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/ajv/lib/runtime/equal.ts

@@ -0,0 +1,7 @@
+// https://github.com/ajv-validator/ajv/issues/889
+import * as equal from "fast-deep-equal"
+
+type Equal = typeof equal & {code: string}
+;(equal as Equal).code = 'require("ajv/dist/runtime/equal").default'
+
+export default equal as Equal