fix: use inequality instead of greater than for timestamp check

Addresses PR feedback to rely on timestamp inequality since it is more robust to clock issues and timestamp resolution when saving on the backend.

src/App.tsx

@@ -433,7 +433,7 @@ export function App() {
     if (
       activeDrawing &&
       loadedUpdatedAtRef.current &&
-      activeDrawing.updatedAt > loadedUpdatedAtRef.current &&
+      activeDrawing.updatedAt !== loadedUpdatedAtRef.current &&
       !inFlightSaveRef.current &&
       !inFlightTitleSaveRef.current
     ) {