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

docs/ARCHITECTURE.md

@@ -250,8 +250,8 @@ Every `POLL_INTERVAL` ms (default 5000), the poller fetches from all services in
 | SABnzbd Queue | `GET /api?mode=queue` | `output=json` |
 | SABnzbd History | `GET /api?mode=history` | `limit=10` |
 | Sonarr Tags | `GET /api/v3/tag` | — |
-| Sonarr Queue | `GET /api/v3/queue` | `includeSeries=true` |
-| Sonarr History | `GET /api/v3/history` | `pageSize=10` |
+| Sonarr Queue | `GET /api/v3/queue` | `includeSeries=true`, `includeEpisode=true` |
+| Sonarr History | `GET /api/v3/history` | `pageSize=10`, `includeEpisode=true` |
 | Radarr Queue | `GET /api/v3/queue` | `includeMovie=true` |
 | Radarr History | `GET /api/v3/history` | `pageSize=10` |
 | Radarr Tags | `GET /api/v3/tag` | — |
@@ -408,7 +408,7 @@ Each matched download produces an object with:
 | `speed` | string | Current download speed |
 | `eta` | string | Estimated time remaining |
 | `seriesName` / `movieName` | string | Friendly media title |
-| `episodeInfo` / `movieInfo` | object | Full *arr queue/history record |
+| `episodes` | `{season, episode, title}[]` | (Series only) Episodes covered by this download, sorted by season/episode. Single-episode downloads have one entry; series packs have multiple. Empty array if Sonarr has no episode data. |
 | `allTags` | string[] | All resolved tag labels on the series/movie |
 | `matchedUserTag` | string / null | Tag label matching the requesting user, or `null` |
 | `tagBadges` | `{label, matchedUser}[]` / undefined | (Admin `showAll` only) Each tag classified against full Emby user list |
@@ -616,6 +616,9 @@ Returns recently completed (imported or failed) downloads from Sonarr/Radarr his
       "outcome": "imported",
       "title": "Show.S01E01.720p",
       "seriesName": "My Show",
+      "episodes": [
+        { "season": 1, "episode": 1, "title": "Pilot" }
+      ],
       "coverArt": "https://…/poster.jpg",
       "completedAt": "2026-05-15T18:00:00.000Z",
       "quality": "720p",
@@ -631,6 +634,7 @@ Returns recently completed (imported or failed) downloads from Sonarr/Radarr his
 ```
 
 - `outcome` is `"imported"` or `"failed"`. Records with other event types (e.g. `grabbed`) are filtered out.
+- `episodes` is a sorted array of `{ season, episode, title }` objects. Single-episode downloads have one entry; series packs have multiple. `title` is `null` if not returned by Sonarr. Empty array if Sonarr has no episode data.
 - `failureMessage` is only included when the authenticated user is an admin and `outcome` is `"failed"`.
 - `arrRecordId` is only included for admin users.
 - Results are sorted newest first.