polish iOS study flow

mobile/ios-app/Core/Analytics/AnalyticsClient.swift

@@ -1,13 +1,28 @@
+import Combine
 import Foundation
 
 protocol AnalyticsTracking {
     func track(_ event: String, attributes: [String: String])
 }
 
-final class HermesAnalyticsClient: AnalyticsTracking {
+struct HermesTrackedEvent: Identifiable, Equatable {
+    let id = UUID()
+    let event: String
+    let attributes: [String: String]
+    let timestamp: Date
+}
+
+@MainActor
+final class HermesAnalyticsClient: ObservableObject, AnalyticsTracking {
+    @Published private(set) var trackedEvents: [HermesTrackedEvent] = []
+
     func track(_ event: String, attributes: [String: String]) {
-        // Scaffold implementation.
-        _ = event
-        _ = attributes
+        trackedEvents.append(
+            HermesTrackedEvent(
+                event: event,
+                attributes: attributes,
+                timestamp: Date()
+            )
+        )
     }
 }