feat: add greeting header and recently played row to home screen

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

styles.css

@@ -79,6 +79,9 @@ nav{flex:1;overflow-y:auto;padding:4px 10px}
 .page-title em{color:var(--accent);font-style:normal}
 .page-title .blue{color:var(--blue)}
 
+/* ── HOME GREETING ── */
+.home-greeting{font-size:22px;font-weight:700;color:var(--text);padding:18px 0 6px;letter-spacing:-.3px}
+
 /* ── SECTION ── */
 .section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;margin-top:24px}
 .section-title{font-size:16px;font-weight:700}