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/dist/refs/json-schema-2019-09/meta/content.json

@@ -0,0 +1,17 @@
+{
+  "$schema": "https://json-schema.org/draft/2019-09/schema",
+  "$id": "https://json-schema.org/draft/2019-09/meta/content",
+  "$vocabulary": {
+    "https://json-schema.org/draft/2019-09/vocab/content": true
+  },
+  "$recursiveAnchor": true,
+
+  "title": "Content vocabulary meta-schema",
+
+  "type": ["object", "boolean"],
+  "properties": {
+    "contentMediaType": {"type": "string"},
+    "contentEncoding": {"type": "string"},
+    "contentSchema": {"$recursiveRef": "#"}
+  }
+}