Add source filters and a full-window media view

poc/public/media.css

@@ -2,10 +2,13 @@
 
 .vk-media-overlay {
     position: fixed;
-    inset: 0;
+    left: 0;
+    right: 0;
+    top: var(--media-top, 50px);
+    bottom: 0;
     z-index: 90;
     display: flex;
-    background: color-mix(in srgb, var(--color-neutral-900) 70%, transparent);
+    background: var(--color-bg);
 }
 
 .vk-media-overlay[hidden] {
@@ -16,13 +19,14 @@
     display: flex;
     flex-direction: column;
     gap: 10px;
-    width: min(1100px, 100%);
-    margin: 24px auto;
-    padding: 14px;
+    width: 100%;
+    height: 100%;
+    margin: 0;
+    padding: 14px 18px;
     overflow: hidden;
-    border-radius: var(--radius-lg, 12px);
+    border-radius: 0;
     background: var(--color-bg);
-    box-shadow: inset 0 0 0 1px var(--color-neutral-800);
+    box-shadow: none;
 }
 
 .vk-media-head {