fix(scripts): fail update-export-versions if snapshot update fails

The script was silently swallowing errors when snapshot updates failed,
causing versions.ts to be committed without matching snapshots. This led
to CI failures in the coverage workflow.

Now the script exits with code 1 if snapshot update fails, preventing
the mismatched state from being committed.

Author: pasevin

scripts/update-export-versions.cjs

@@ -99,9 +99,14 @@ const updateSnapshots = () => {
     console.log('✅ Snapshots updated successfully!');
   } catch (error) {
     console.error('❌ Failed to update snapshots:', error.message);
-    console.log(
-      '⚠️  Please run "pnpm --filter @openzeppelin/ui-builder-app test src/export/__tests__/ -- -u" manually'
+    console.error(
+      '⚠️  Snapshot update failed. This will cause CI failures if versions.ts is committed without matching snapshots.'
     );
+    console.error(
+      '   To fix manually, run: pnpm --filter @openzeppelin/ui-builder-app test src/export/__tests__/ -- -u'
+    );
+    // Exit with error code to prevent committing mismatched versions
+    process.exit(1);
   }
 };