Move library collections as a group and map v2 identity refs.

Collapsed collection actions now move, rename, delete, and rerun every part so chains stay together. Identity mode follows the v2u3 Ref2VA picture wiring.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/plugins/library-cleanup.ts

@@ -0,0 +1,22 @@
+import { sweepAllExtensionStills } from '../utils/library'
+
+export default defineNitroPlugin(() => {
+  try {
+    const result = sweepAllExtensionStills()
+    if (result.deleted) {
+      console.log(JSON.stringify({
+        src: 'library',
+        event: 'purge-extension-stills',
+        owners: result.owners,
+        deleted: result.deleted,
+        filenames: result.filenames.slice(0, 40)
+      }))
+    }
+  } catch (error) {
+    console.log(JSON.stringify({
+      src: 'library',
+      event: 'purge-extension-stills-error',
+      error: error instanceof Error ? error.message : String(error)
+    }))
+  }
+})