fix(ui): icon updates, remove mic button, theme fixes

- LiveSearch: replace SlidersVertical with TextSearch for advanced search
- AlbumHeader: add Highlighter icon for artist bio button
- PlayerBar: remove unused lyrics/mic button
- components.css: album-detail-badge always opaque (accent bg, white text)
- theme: Middle Earth — remove sidebar stripes, fix queue/artist/bio contrast
- theme: Toy Tale — fix muted text, queue tabs, sidebar labels, divider
- theme: Tetrastack — brighten purple/blue palette, raise text-muted contrast
- theme: Horde & Alliance — remove repeating sidebar line pattern

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

src/components/LiveSearch.tsx

@@ -1,6 +1,6 @@
 import React, { useState, useEffect, useRef, useCallback } from 'react';
 import { useNavigate } from 'react-router-dom';
-import { Search, Disc3, Users, Music, SlidersVertical } from 'lucide-react';
+import { Search, Disc3, Users, Music, SlidersVertical, TextSearch } from 'lucide-react';
 import { search, SearchResults, buildCoverArtUrl } from '../api/subsonic';
 import { usePlayerStore, songToTrack } from '../store/playerStore';
 import { useAuthStore } from '../store/authStore';
@@ -126,7 +126,7 @@ export default function LiveSearch() {
           data-tooltip-pos="bottom"
           aria-label={t('search.advanced')}
         >
-          <SlidersVertical size={14} />
+          <TextSearch size={14} />
         </button>
       </div>