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

server/routes/history.js

@@ -82,6 +82,37 @@ function buildTagBadges(allTags, embyUserMap) {
   });
 }
 
+// Extract episode info from a Sonarr history record.
+function extractEpisode(record) {
+  const s = record.seasonNumber;
+  const e = record.episodeNumber;
+  if (s == null || e == null) return null;
+  const title = record.episode && record.episode.title ? record.episode.title : null;
+  return { season: s, episode: e, title };
+}
+
+// Find all episodes associated with a download by matching all history records
+// that share the same source title.  Returns sorted, deduplicated array.
+function gatherEpisodes(titleLower, records) {
+  const episodes = [];
+  const seen = new Set();
+  for (const r of records) {
+    const rTitle = (r.sourceTitle || r.title || '').toLowerCase();
+    if (rTitle && (rTitle.includes(titleLower) || titleLower.includes(rTitle))) {
+      const ep = extractEpisode(r);
+      if (ep) {
+        const key = `${ep.season}x${ep.episode}`;
+        if (!seen.has(key)) {
+          seen.add(key);
+          episodes.push(ep);
+        }
+      }
+    }
+  }
+  episodes.sort((a, b) => a.season - b.season || a.episode - b.episode);
+  return episodes;
+}
+
 function getSonarrLink(series) {
   if (!series || !series._instanceUrl || !series.titleSlug) return null;
   return `${series._instanceUrl}/series/${series.titleSlug}`;
@@ -177,11 +208,13 @@ router.get('/recent', requireAuth, async (req, res) => {
           ? record.quality.quality.name
           : null;
 
+        const sourceTitle = record.sourceTitle || record.title || series.title;
         const item = {
           type: 'series',
           outcome,
-          title: record.sourceTitle || record.title || series.title,
+          title: sourceTitle,
           seriesName: series.title,
+          episodes: gatherEpisodes(sourceTitle.toLowerCase(), sonarrHistory),
           coverArt: getCoverArt(series),
           completedAt: record.date,
           quality,