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/de.ts

@@ -217,6 +217,8 @@ export const deTranslation = {
     title: 'Zufallsmix',
     remix: 'Neu mixen',
     remixTooltip: 'Neue Songs laden',
+    remixGenre: '{{genre}} neu mixen',
+    remixTooltipGenre: 'Neue {{genre}}-Songs laden',
     playAll: 'Alle abspielen',
     trackTitle: 'Titel',
     trackArtist: 'Künstler',
@@ -238,6 +240,7 @@ export const deTranslation = {
     blacklistToggle: 'Keyword-Filter',
     genreMixTitle: 'Genre-Mix',
     genreMixDesc: 'Top 20 Genres nach Songanzahl — klicken für einen Zufallsmix',
+    genreMixAll: 'Alle Songs',
     genreMixLoadMore: '10 weitere laden',
     genreMixNoGenres: 'Keine Genres auf dem Server gefunden.',
     shuffleGenres: 'Andere Genres anzeigen',