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.jsx

@@ -118,6 +118,12 @@ function App() {
             <div className="downloads-list">
               {downloads.map((download, index) => (
                 <div key={index} className={`download-card ${download.type}`}>
+                  {download.coverArt && (
+                    <div className="download-cover">
+                      <img src={download.coverArt} alt={download.movieName || download.seriesName || download.title} />
+                    </div>
+                  )}
+                  <div className="download-info">
                   <div className="download-header">
                     <span className={`download-type ${download.type}`}>
                       {download.type === 'series' ? '📺 Series' : '🎬 Movie'}
@@ -163,6 +169,7 @@ function App() {
                       </div>
                     )}
                   </div>
+                  </div>
                 </div>
               ))}
             </div>