Fix vinyl angle persistence on toggle, group player toggle buttons

- Save vinyl rotation angle before flipping vinylMode flag off
- Wrap vinyl + visualizer buttons in .player-toggles container
- Move margin-left:auto from individual buttons to group

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

media_server/static/css/styles.css

@@ -903,6 +903,13 @@ button:disabled {
     gap: 0.75rem;
 }
 
+.player-toggles {
+    display: flex;
+    align-items: center;
+    gap: 0.375rem;
+    margin-left: auto;
+}
+
 .vinyl-toggle-btn {
     width: 28px;
     height: 28px;
@@ -916,7 +923,6 @@ button:disabled {
     align-items: center;
     justify-content: center;
     transition: all 0.2s;
-    margin-left: auto;
 }
 
 .vinyl-toggle-btn:hover {