feat(album): show all genres in album details, linkable to genre pages (#1186)

* feat(album): show all genres in album details, linkable to genre pages

The album header listed only a single genre. It now renders every genre
from the album's OpenSubsonic genres[] (falling back to splitting the
legacy genre string), each linking to its genre page via the existing
genre route.

* docs(changelog): multiple genres in album details (#1186)

* refactor(genres): extract genreColor into a shared util

* feat(album): union album and track genres behind a +N cursor menu

* feat(album): read album detail from the library index when ready

* docs(changelog): expand the album genres entry

* feat(album): genre pill row with keyboard-navigable popover

* test(offline): cover index-first resolveAlbum path with mocked libraryIsReady

* refactor(styles): move album-detail genre styles out of cover-lightbox.css

CHANGELOG.md

@@ -108,6 +108,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * **Settings → Audio → Track transitions → AutoDJ:** choose **Auto** (content-driven overlap, up to 12 s) or **Limit** (slider 2–30 s, default 15 s when enabled) to cap how long AutoDJ may overlap tracks.
 * The cap applies to end-of-track planning, JS auto-advance, smooth skip, and Orbit transition sync; the audio engine accepts dynamic overlap overrides up to 30 s.
 
+### Multiple genres in album details
+
+**By [@Psychotoxical](https://github.com/Psychotoxical), PR [#1186](https://github.com/Psychotoxical/psysonic/pull/1186)**, suggested by [@Thraka](https://github.com/Thraka)
+
+* Album details now surface every genre a release spans instead of just the first one: the main genre shows inline with a **+N** chip that opens the full, clickable list, each genre linking to its genre page.
+* Genres combine album and track tags (matching the genre browser) and read from the local library index when it is ready, so they also work offline.
+
 
 ## Changed