feat(random-mix): context-aware remix button + genre reset chip

Remix button now targets the active context: relabels to "{{genre}} neu
mixen" when a genre is selected and re-fetches that genre instead of the
global random pool. "Alle Songs" chip added as first genre option to
reset back to the full library mix without leaving the page.

Also fixes album-grid cards stretching to full page height on macOS
WebKit (align-items: start on .album-grid-wrap).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/locales/en.ts

@@ -218,6 +218,8 @@ export const enTranslation = {
     title: 'Random Mix',
     remix: 'Remix',
     remixTooltip: 'Load new random songs',
+    remixGenre: 'Remix {{genre}}',
+    remixTooltipGenre: 'Load new {{genre}} songs',
     playAll: 'Play All',
     trackTitle: 'Title',
     trackArtist: 'Artist',
@@ -239,6 +241,7 @@ export const enTranslation = {
     blacklistToggle: 'Keyword Filter',
     genreMixTitle: 'Genre Mix',
     genreMixDesc: 'Top 20 genres by song count — click to load a random mix',
+    genreMixAll: 'All Songs',
     genreMixLoadMore: 'Load 10 more',
     genreMixNoGenres: 'No genres found on server.',
     shuffleGenres: 'Show different genres',