feat(ground-suite): add replay observability console

ground-suite/lib/shared/widgets/severity_badge.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+
+import '../../core/observations/observed_event.dart';
+
+class SeverityBadge extends StatelessWidget {
+  const SeverityBadge({required this.level, super.key});
+
+  final MavSeverity level;
+
+  @override
+  Widget build(BuildContext context) {
+    final (icon, color) = switch (level.wireValue) {
+      0 || 1 || 2 || 3 => (Icons.error_outline, Colors.red.shade700),
+      4 => (Icons.warning_amber_outlined, Colors.orange.shade800),
+      5 || 6 => (Icons.info_outline, Colors.blue.shade700),
+      7 => (Icons.bug_report_outlined, Colors.grey.shade700),
+      _ => (Icons.help_outline, Colors.grey.shade700),
+    };
+
+    return Semantics(
+      label: 'Severity: ${level.label}',
+      child: Icon(icon, color: color),
+    );
+  }
+}