Protocol 15: one shared session log on the server, chat never logged, Mark a problem

Every app streams its redacted diagnostic lines (server time, batched
every 10 s, gzip, buffered while offline) to POST /l/; the server merges
them with its own into session-YYYY-MM-DD.log in time order, tagged by
who. Opt-out in Settings > About; Mark a problem (Ctrl+Shift+B, the
player menus, About) writes a marker with an optional note. Copy
diagnostics can include the server's session log. Chat text never
reaches any log.

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

apps/desktop/lib/src/controls/player_settings.dart

@@ -8,6 +8,7 @@ import '../jellyfin/track_prefs.dart' show MpvTrack;
 import '../playback/playback_controller.dart' show PlaybackController, RenderMode;
 import '../shaders/shader_presets.dart';
 import '../state/session_state.dart';
+import '../shell/mark_problem.dart';
 import '../shell/motion.dart';
 import '../state/settings.dart';
 import '../widgets/app_menu.dart';
@@ -332,9 +333,16 @@ class PlayerSettingsCard extends StatelessWidget {
                 const TrackSetting(type: JellyfinStreamType.audio),
               ],
               const SizedBox(height: 4),
-              Text(
-                'Custom shader files: Settings → Player',
-                style: TextStyle(color: Theme.of(context).colorScheme.onSurfaceVariant, fontSize: 12),
+              Row(
+                children: [
+                  Expanded(
+                    child: Text(
+                      'Custom shader files: Settings → Player',
+                      style: TextStyle(color: Theme.of(context).colorScheme.onSurfaceVariant, fontSize: 12),
+                    ),
+                  ),
+                  const MarkProblemButton(),
+                ],
               ),
             ],
           ),