Add comprehensive training plan reference page that displays:
- Current phase status (day, phase name, training type, weekly limit)
- Phase overview cards for all 5 cycle phases with weekly intensity limits
- Strength training exercises reference with sets and reps
- Rebounding techniques organized by phase
- Weekly training guidelines for each phase
The page fetches cycle data from /api/cycle/current and highlights
the current phase. Implements full TDD with 16 tests covering loading
states, error handling, phase display, and exercise reference sections.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>