Redesign the Trails sort, search, and filter controls

[NicooleT]

Summary

• replace the always-visible search, filter chips, and segmented sort toggle with a compact progressive control row
• open Name, Distance, and Rating choices in an animated sort sheet
• expand and focus search on demand, then restore the original Sort By + search-button state whenever search loses focus
• keep the filter action icon-only while preserving the active search when the filter sheet opens
• center both sheet titles, remove their close buttons, and support dismissal by tapping outside or dragging the handle down
• remove the trail result-total row
• preserve sorting, filtering, light/dark theming, keyboard behavior, and accessible labels

Closes #29

Validation

• npm run lint
• npm run typecheck
• git diff --check
• Stim iOS launch and 3-second stability verification on stim-issue-29-trail-controls
• clean Stim runtime error log
• agent-device assertion: ordinary search blur clears the query and restores Sort by Name plus Open trail search
• agent-device assertion: opening and dismissing filters preserves and refocuses the search input
• agent-device assertion: both sheets expose a drag-to-dismiss handle and no close button
• manual simulator checks for icon-only filter state, centered sheet titles, outside-tap dismissal, and downward handle-drag dismissal

Before and after evidence

Before: the closed search control could collapse to zero width after focus was lost; the filter action expanded to show “Filters”; sheets used left-aligned titles and close buttons; a trail total remained below the controls.

After: the circular search action reliably returns after blur, the filter action stays icon-only, both sheets have centered titles and dismiss by scrim or handle drag, and the result-total row is gone. Screenshots and a short motion recording were captured from the same iOS simulator, Trails route, portrait orientation, and seed data.