fix: jobless video assets no longer 500 the library click

Legacy/edge-case video_assets rows without a processing job threw 'has no
processing job' from getVideoStatus — the library detail click 500ed.
VideoStatus.processingJob is now nullable end to end (api type, DTO, web
consumers null-guarded); a jobless asset renders as queued.

apps/web/src/app/(main)/video/page.tsx

@@ -119,7 +119,7 @@ export default function VideoPage(): React.ReactElement {
   const applyStatus = useCallback((status: VideoStatusDto): void => {
     const entry: VideoLibraryEntryDto = {
       videoAsset: status.videoAsset,
-      processingState: status.processingJob.state,
+      processingState: status.processingJob?.state ?? "queued",
       publications: [],
     };
     setItems((current) => [entry, ...(current ?? []).filter((e) => e.videoAsset.id !== entry.videoAsset.id)]);