Ensure modal stack stays above sidebar

css/style.css

@@ -23,12 +23,12 @@
   --scrollbar-thumb: rgba(255, 255, 255, 0.3);
   --scrollbar-thumb-hover: rgba(255, 255, 255, 0.4);
   /* Sidebar stack must remain below modal overlays. */
-  --z-sidebar: 30;
-  --z-sidebar-overlay: 20;
-  --z-modal-root: 80;
-  --z-modal-overlay: 70;
-  --z-modal-content: 90;
-  --z-modal-player: 120;
+  --z-sidebar-overlay: 10;
+  --z-sidebar: 20;
+  --z-modal-root: 100;
+  --z-modal-overlay: 110;
+  --z-modal-content: 120;
+  --z-modal-player: 130;
   --sidebar-width-expanded: 16rem;
   --sidebar-width-collapsed: 4rem;
   --sidebar-width: var(--sidebar-width-expanded);
@@ -546,6 +546,7 @@ header img {
   inset: 0;
   z-index: var(--z-modal-root);
   pointer-events: none;
+  isolation: isolate;
 }
 
 #modalContainer > * {