v1.4 (build 5)

feat: add set tracking with rest timer, progress bar, and weekly streak

- Exercises now track individual sets (e.g., 3 presses of Done for 3x10)
- Rest timer countdown between sets (90s compounds, 60s isolation)
- Reset button to restart sets mid-exercise
- Progress bar showing completed/total exercises for the day
- Weekly streak dots showing completion for each day of the week
- Strength and Cardio section headers
- Completed exercises sink to bottom of their section
- Cleaned up exercise descriptions (just "3x10" instead of full names)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>