Added containers_scanned flag to StatusInfo in the data model. Starts false, set to true after the first Podman scan completes (~15s after boot). Marketplace now shows a shimmer "Checking..." indicator on app buttons until the scan finishes, preventing users from accidentally re-installing apps that are already present but not yet enumerated. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>