feat: workout flow — detail, player, and complete screens

Workout detail (workout/[id]):
- Dynamic data via useLocalSearchParams + getWorkoutById
- VideoPlayer hero with trainer color gradient fallback
- Exercise list, equipment, music vibe, "Start Workout" CTA

Player (player/[id]):
- useTimer hook drives phase transitions (PREP/WORK/REST/COMPLETE)
- useHaptics for phase changes and countdown ticks
- useAudio for sound effects (beeps, dings, completion chime)
- Real calorie tracking, progress ring, exercise display
- Saves WorkoutResult to activityStore on completion

Complete (complete/[id]):
- Reads real stats from activityStore history
- Burn bar, streak counter, calories/duration/completion stats
- Recommended workouts, share via expo-sharing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/player/CLAUDE.md

@@ -0,0 +1,12 @@
+<claude-mem-context>
+# Recent Activity
+
+<!-- This section is auto-generated by claude-mem. Edit content outside the tags. -->
+
+### Feb 19, 2026
+
+| ID | Time | T | Title | Read |
+|----|------|---|-------|------|
+| #5000 | 9:35 AM | 🔵 | Reviewed Player Screen Implementation | ~522 |
+| #4912 | 8:16 AM | 🔵 | Found doneButton component in player screen | ~104 |
+</claude-mem-context>