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/(tabs)/explore.tsx

@@ -77,6 +77,7 @@ function CollectionCard({
 
   return (
     <Pressable
+      testID={`collection-card-${title.toLowerCase().replace(/\s+/g, '-')}`}
       style={styles.collectionCard}
       onPress={() => {
         haptics.buttonTap()
@@ -121,6 +122,7 @@ function WorkoutCard({
 
   return (
     <Pressable
+      testID={`workout-card-${workout.id}`}
       style={[styles.workoutCard, { borderColor: colors.border.glassLight }]}
       onPress={onPress}
     >
@@ -138,7 +140,7 @@ function WorkoutCard({
       </View>
 
       {isLocked && (
-        <View style={styles.lockBadge}>
+        <View testID={`lock-badge-${workout.id}`} style={styles.lockBadge}>
           <Ionicons name="lock-closed" size={10} color="#FFFFFF" />
         </View>
       )}
@@ -279,8 +281,9 @@ export default function ExploreScreen() {
   }
 
   return (
-    <View style={[styles.container, { backgroundColor: colors.bg.base, paddingTop: insets.top }]}>
+    <View testID="explore-screen" style={[styles.container, { backgroundColor: colors.bg.base, paddingTop: insets.top }]}>
       <ScrollView
+        testID="explore-scroll"
         style={styles.scrollView}
         contentContainerStyle={[styles.scrollContent, { paddingBottom: insets.bottom + 100 }]}
         showsVerticalScrollIndicator={false}
@@ -295,7 +298,7 @@ export default function ExploreScreen() {
         </View>
 
         {collections.length > 0 && (
-          <View style={styles.collectionsSection}>
+          <View testID="collections-section" style={styles.collectionsSection}>
             <StyledText size={22} weight="bold" color={colors.text.primary}>
               {t('screens:explore.collections')}
             </StyledText>
@@ -320,7 +323,7 @@ export default function ExploreScreen() {
         )}
 
         {featured.length > 0 && (
-          <View style={styles.section}>
+          <View testID="featured-section" style={styles.section}>
             <StyledText size={22} weight="bold" color={colors.text.primary}>
               {t('screens:explore.featured')}
             </StyledText>
@@ -337,7 +340,7 @@ export default function ExploreScreen() {
           </View>
         )}
 
-        <View style={styles.filtersSection}>
+        <View testID="filters-section" style={styles.filtersSection}>
           <View style={styles.filterHeader}>
             <StyledText size={22} weight="bold" color={colors.text.primary}>
               {t('screens:explore.allWorkouts')}