fix: Spotify Importer button layout (btn-primary had width:100%)

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

index.html

@@ -344,7 +344,7 @@
               <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="10"/><path d="M8 11.973c2.5-1.473 5.5-.973 7.5.527M9.5 14.473c1.5-.973 3.5-.973 5 .027M7 9c3-1.5 6.5-1 9 1"/></svg>
               <input id="spotify-link-input" type="url" placeholder="Spotify Link einfügen (Track, Album oder Playlist)…" style="font-size:15px" oninput="clearSpotifyPreview()">
             </div>
-            <button class="btn-primary" style="padding:0 18px;font-size:14px;white-space:nowrap;flex-shrink:0" onclick="resolveSpotifyLink()">Importieren</button>
+            <button class="btn-outline" style="padding:0 20px;font-size:14px;font-weight:700;white-space:nowrap;flex-shrink:0;background:linear-gradient(135deg,var(--accent),#c07010);color:#000;border-color:transparent" onclick="resolveSpotifyLink()">Importieren</button>
           </div>
         </div>
         <div id="spotify-importer-hint" style="background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px;font-size:13px;color:var(--text2);line-height:1.8">