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/zh.ts

@@ -217,6 +217,8 @@ export const zhTranslation = {
     title: '随机混音',
     remix: '重新混音',
     remixTooltip: '加载新的随机歌曲',
+    remixGenre: '重混 {{genre}}',
+    remixTooltipGenre: '加载新的{{genre}}歌曲',
     playAll: '全部播放',
     trackTitle: '标题',
     trackArtist: '艺术家',
@@ -238,6 +240,7 @@ export const zhTranslation = {
     blacklistToggle: '关键词过滤',
     genreMixTitle: '流派混音',
     genreMixDesc: '按歌曲数量排列的前 20 个流派 — 点击获取随机混音',
+    genreMixAll: '所有歌曲',
     genreMixLoadMore: '加载 10 首更多',
     genreMixNoGenres: '服务器上未找到流派。',
     shuffleGenres: '显示其他流派',