feat: fix download-to-user matching, add cover art to downloads

- Fix seriesMap key (use Sonarr internal id, not tvdbId)
- Fix Sonarr tag resolution (use tag map like Radarr)
- Use sourceTitle for history record matching
- Fall back to embedded movie/series objects when API timeouts
- Add includeMovie/includeSeries params to queue/history API calls
- Add coverArt field to all download responses (TMDB poster URLs)
- Add cover art display to frontend download cards
- Fix user-summary route to use instance config and tag maps

client/src/App.css

@@ -155,6 +155,28 @@ body {
   border-radius: 10px;
   padding: 20px;
   transition: transform 0.2s, box-shadow 0.2s;
+  display: flex;
+  gap: 20px;
+  align-items: flex-start;
+}
+
+.download-cover {
+  flex-shrink: 0;
+  width: 80px;
+  border-radius: 6px;
+  overflow: hidden;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
+}
+
+.download-cover img {
+  width: 100%;
+  height: auto;
+  display: block;
+}
+
+.download-info {
+  flex: 1;
+  min-width: 0;
 }
 
 .download-card:hover {