feat: integrate Microsoft Clarity for mobile session recording and heatmaps

lib/core/analytics/clarity_analytics.dart

@@ -0,0 +1,14 @@
+import 'package:clarity_flutter/clarity_flutter.dart';
+
+/// Microsoft Clarity configuration — separate mobile project so recordings
+/// and heatmaps are isolated from web traffic.
+class ClarityAnalytics {
+  ClarityAnalytics._();
+
+  static const _projectId = 'wgtcstm336';
+
+  static final ClarityConfig config = ClarityConfig(
+    projectId: _projectId,
+    logLevel: LogLevel.None,
+  );
+}