Show bitrate in browser, remove type labels and Play All text

- Extract bitrate alongside duration in browse_directory via get_media_info
- Display bitrate in large card view metadata (duration · bitrate · size)
- Replace Audio/Video type badge with bitrate column in list view
- Remove Play All button text, keep icon only
- Add formatBitrate helper function

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

media_server/static/css/styles.css

@@ -1542,23 +1542,12 @@
     min-width: 0;
 }
 
-.browser-list-type {
-    font-size: 0.625rem;
-    text-transform: uppercase;
-    font-weight: 600;
-    color: var(--text-secondary);
-    padding: 0.15rem 0.5rem;
-    background: var(--bg-primary);
-    border-radius: 4px;
+.browser-list-bitrate {
+    font-size: 0.75rem;
+    color: var(--text-muted);
     white-space: nowrap;
-}
-
-.browser-list-type.audio {
-    color: var(--accent);
-}
-
-.browser-list-type.video {
-    color: #3b82f6;
+    min-width: 55px;
+    text-align: right;
 }
 
 .browser-list-duration {