End of video plays out, no false 'loading' near/after the end; bigger status pill avatars; start card fits the mini

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/lib/src/session/session_coordinator.dart

@@ -717,7 +717,7 @@ class SessionCoordinator {
       return;
     }
     for (final m in r.members) {
-      if (m.inSet && m.buffered < RelayConstants.minBufferSecs) {
+      if (m.inSet && m.buffered < r.bufferNeed) {
         starving.value =
             'waiting for ${m.name} — ${m.buffered.toStringAsFixed(1)} s buffered';
         return;