add individual library scanning

src/app/manage/page.tsx

@@ -286,7 +286,10 @@ function AddLibraryForm({ onAdded }: { onAdded: () => void }) {
         return
       }
 
-      // Success — reset form
+      // Success — fire scan for the new library (fire-and-forget)
+      void fetch(`/api/scan/${encodeURIComponent((data as { id: string }).id)}`, { method: 'POST' })
+
+      // Reset form
       setName('')
       setLibPath('')
       setType('games')