feat: show the queued format in the Downloading table (closes #551)

With the format picked per download rather than left on one setting, the
Downloading list gave no way to tell which item was queued as what until
it landed in Completed. The new column labels the format exactly as the
form does, reusing the same option lists, and falls back to the raw value
uppercased for a record queued before an option existed.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

ui/src/app/app.html

@@ -693,6 +693,7 @@
             <app-select-all-checkbox #queueMasterCheckboxRef [id]="'queue'" [list]="downloads.queue" (changed)="queueSelectionChanged($event)" />
           </th>
           <th scope="col">Video</th>
+          <th scope="col" style="width: 7rem;">Format</th>
           <th scope="col" style="width: 8rem;">Speed</th>
           <th scope="col" style="width: 7rem;">ETA</th>
           <th scope="col" style="width: 6rem;"></th>
@@ -726,6 +727,7 @@
                 }
               </div>
             </td>
+            <td class="text-nowrap">{{ formatLabel(download.value) }}</td>
             <td>{{ download.value.speed | speed }}</td>
             <td>{{ download.value.eta | eta }}</td>
             <td>