feat: show episode info on download and history cards

- Add includeEpisode:true to Sonarr queue and history API requests
  in both the poller and historyFetcher
- Add extractEpisode() / gatherEpisodes() helpers in dashboard.js
  and history.js to build a sorted, deduplicated episodes array
  covering all records matching a download title (handles multi-
  episode packs and series packs)
- Replace episodeInfo: sonarrMatch with episodes: gatherEpisodes()
  across all 8 assignment sites in dashboard.js
- Add episodes field to /api/history/recent response items
- Frontend: formatEpisodeInfo() renders S01E05 for single episodes
  or 'Multiple episodes' with hover tooltip listing all for packs
- CSS: .episode-info and .multi-episode tooltip styles
- ARCHITECTURE.md: update polling table and download/history schemas

public/style.css

@@ -485,6 +485,36 @@ body {
   font-size: 0.8rem;
 }
 
+.episode-info {
+  color: var(--text-secondary);
+  font-size: 0.78rem;
+  margin: -2px 0 6px;
+}
+
+.episode-info.multi-episode {
+  cursor: help;
+  text-decoration: underline dotted;
+  position: relative;
+}
+
+.episode-info.multi-episode:hover::after {
+  content: attr(data-tooltip);
+  position: absolute;
+  left: 0;
+  top: 100%;
+  z-index: 20;
+  background: var(--card-bg);
+  color: var(--text-primary);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  padding: 8px 10px;
+  font-size: 0.75rem;
+  white-space: pre-line;
+  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
+  max-width: 320px;
+  pointer-events: none;
+}
+
 /* ===== Detail Row (Inline) ===== */
 .download-details {
   display: flex;