Grid rewrite:
- Fully interactive lanes×timeslots grid with click/drag cell selection
- Click individual cells, drag-select rectangles, row headers (full lane),
  column headers (full time slot)
- Inline booking panel slides up from bottom when cells are selected —
  no separate page needed, book directly from the grid
- Recurring schedules shown as purple cells on the grid
- Real-time refresh every 30s via AJAX
- Visual pool dimensions display with lane numbers

New: Weekly Schedules (pool_schedules):
- Create recurring weekly templates (coach, academy, age group, gender, lanes)
- Effective date range, color-coded, max swimmers per schedule
- Auto-displayed on the grid for the matching day of week
- Manage page with create form + list of all schedules with delete

New: Pool Dashboard (/pool/{id}/dashboard):
- KPI cards: today/week/month bookings, swimmers, revenue, utilization %
- Heatmap: bookings per hour per day of week (last 30 days) with color intensity
- Booking type breakdown with progress bars
- Lane utilization bars (hours used vs available)
- Peak hours chart with AI recommendations for increasing occupancy
- Low-utilization detection + suggestions

Updated pool index:
- Cards with mini pool visual, 3 action buttons (grid, dashboard, schedules)
- Better visual hierarchy and information density
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>