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>
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