test: add QA coverage — access unit tests, VideoPlayer snapshots, Maestro E2E flows, testIDs

- Add testIDs to explore, workout detail, and collection detail screens
- Add testID prop to VideoPlayer component
- Create access service unit tests (isFreeWorkout, canAccessWorkout)
- Create VideoPlayer rendering snapshot tests (preview/background modes)
- Create Maestro E2E flows: explore-freemium, collection-detail
- Update tab-navigation flow with Explore screen assertions
- Update profile-settings flow with real activity stat assertions
- Update all-tests suite to include new flows

app/collection/[id].tsx

@@ -79,10 +79,10 @@ export default function CollectionDetailScreen() {
   }
 
   return (
-    <View style={[styles.container, { paddingTop: insets.top }]}>
+    <View testID="collection-detail-screen" style={[styles.container, { paddingTop: insets.top }]}>
       {/* Header */}
       <View style={styles.header}>
-        <Pressable onPress={handleBack} style={styles.backButton}>
+        <Pressable testID="collection-back-button" onPress={handleBack} style={styles.backButton}>
           <Ionicons name="chevron-back" size={24} color={colors.text.primary} />
         </Pressable>
         <StyledText size={22} weight="bold" color={colors.text.primary} numberOfLines={1} style={{ flex: 1, textAlign: 'center' }}>
@@ -97,7 +97,7 @@ export default function CollectionDetailScreen() {
         showsVerticalScrollIndicator={false}
       >
         {/* Hero Card */}
-        <View style={styles.heroCard}>
+        <View testID="collection-hero" style={styles.heroCard}>
           <LinearGradient
             colors={collection.gradient ?? [BRAND.PRIMARY, '#FF3B30']}
             start={{ x: 0, y: 0 }}
@@ -133,6 +133,7 @@ export default function CollectionDetailScreen() {
         {workouts.map((workout) => (
           <Pressable
             key={workout.id}
+            testID={`collection-workout-${workout.id}`}
             style={styles.workoutCard}
             onPress={() => handleWorkoutPress(workout.id)}
           >