Redesign schedule overview: inline groups, read-only day bar, curve preview

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Context

The schedule page redesign (#256) removed some valuable features from the week overview. The current UI shows a redundant interactive day bar + a Week Overview card that navigates to a per-day detail view. The old schedule groups concept (grouping days that share the same schedule, e.g. Mon-Thu vs Fri-Sun) was lost.

Design

Top day bar (S M T W T F S)

• Read-only — not buttons, just indicators
• Highlights the days belonging to the currently-selected schedule group
• If nothing is selected, no days are highlighted

Week Overview — inline schedule groups

• Render schedule groups inline (not as a dropdown or navigation card)
• Each group shows: group name/days, temperature range, schedule summary
• Tapping a group:
  • Highlights its member days in the top day bar
  • Shows the temperature curve preview for that group below
• Groups come from the schedule_groups table (already in dev)

Curve preview

• When a group is selected, display the CurveChart component showing the active temperature curve
• This was previously visible but removed during the redesign

Edit flow

• Explicit "Edit" button on each group card instead of the current tap-card-with-arrow pattern
• Clicking "Edit" navigates to the day detail / curve editor for that group

Current behavior

• Interactive day bar at top (redundant with Week Overview)
• Week Overview is a card with day pills that navigates to per-day detail
• No group concept — each day is independent
• Curve only visible after drilling into day detail