Acceptance: matching single-file Image/PDF source cards show filename, detected format, size, accessible remove/reset; Image uses a local thumbnail with object URL cleanup; PDF reuses existing icon treatment; stale inspection/output state clears; responsive and keyboard accessible.
Acceptance: matching single-file Image/PDF source cards show filename, detected format, size, accessible remove/reset; Image uses a local thumbnail with object URL cleanup; PDF reuses existing icon treatment; stale inspection/output state clears; responsive and keyboard accessible.