feat(requests): show ingest progress while requests are in flight

After Lidarr accepts a request the local reconciler imports albums and
tracks as they arrive — but until the request hit 'completed' the
operator had no way to see "is anything happening?" The /requests and
/admin/requests rows now surface a live progress line whenever the
request's matched entity has children in our library.

Backend:
- New CountAlbumsByArtist + CountTracksByArtist sqlc queries.
- requestView gains imported_album_count and imported_track_count.
- New fillProgress helper computes them from the matched entity:
  - kind=artist  → counts albums + tracks under matched_artist_id
  - kind=album   → counts tracks under matched_album_id
  - kind=track   → 1 once matched_track_id is set
  N+1 in the list endpoints; acceptable at admin scale.
- handleListRequests, handleGetRequest, and handleListAdminRequests
  populate the new fields on every response.

Frontend:
- LidarrRequest TS type extended with the two counters.
- Both the operator's /requests page and the admin /admin/requests
  page render an accent-colored line under the row meta when at
  least one counter is non-zero, e.g.:
    Artist:  "5 albums · 47 tracks ingested"
    Album:   "12 tracks ingested"
    Track:   "Track ingested"
- Updated test fixtures to include the new required fields.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/routes/admin/requests/+page.svelte

@@ -256,6 +256,18 @@
             <div class="truncate text-sm text-text-secondary">
               {rowMeta(r)}
             </div>
+            {#if r.imported_album_count > 0 || r.imported_track_count > 0}
+              <div class="text-sm text-accent" data-testid="ingest-progress">
+                {#if r.kind === 'artist'}
+                  {r.imported_album_count} {r.imported_album_count === 1 ? 'album' : 'albums'}
+                  · {r.imported_track_count} {r.imported_track_count === 1 ? 'track' : 'tracks'} ingested
+                {:else if r.kind === 'album'}
+                  {r.imported_track_count} {r.imported_track_count === 1 ? 'track' : 'tracks'} ingested
+                {:else}
+                  Track ingested
+                {/if}
+              </div>
+            {/if}
             {#if r.kind === 'track' && r.album_title}
               <div class="text-sm text-text-secondary" data-testid="track-disclosure">
                 Approving will add the album <em class="font-medium text-text-primary">{r.album_title}</em>.

web/src/routes/admin/requests/requests.test.ts

@@ -37,7 +37,9 @@ const baseRow: LidarrRequest = {
   artist_name: 'Boards of Canada',
   album_title: 'Geogaddi',
   requested_at: '2026-04-29T10:00:00Z',
-  updated_at: '2026-04-29T10:00:00Z'
+  updated_at: '2026-04-29T10:00:00Z',
+  imported_album_count: 0,
+  imported_track_count: 0
 };
 
 afterEach(() => vi.clearAllMocks());