feat: show iTunes enrichment status indicator in Spotify importer

styles.css

@@ -723,6 +723,9 @@ nav{flex:1;overflow-y:auto;padding:4px 10px}
 .list-search{width:100%;box-sizing:border-box;padding:8px 12px 8px 32px;background:var(--surface);border:1px solid var(--border2);border-radius:8px;color:var(--text1);font-size:13px;font-family:var(--font);outline:none;transition:border-color .15s}
 .list-search:focus{border-color:var(--accent)}
 .list-search::placeholder{color:var(--text3)}
+#spotify-enrich-status{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text2);padding:8px 12px;margin-bottom:8px;background:var(--surface);border:1px solid var(--border2);border-radius:8px;transition:opacity .4s}
+#spotify-enrich-status.done{color:var(--accent)}
+#spotify-enrich-status .enrich-spinner{width:12px;height:12px;border:2px solid var(--border2);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite;flex-shrink:0}
 .topsong-item{display:grid;grid-template-columns:28px 44px 1fr auto;align-items:center;gap:10px;padding:7px 10px;border-radius:8px;cursor:pointer;transition:background .15s}
 .topsong-item:hover{background:var(--surface)}
 .topsong-num{font-size:11px;color:var(--text3);font-family:var(--mono);text-align:center}