feat: expand trip inline stats to 6 stats + add cycling panel with GPX parsing
- Expanded stats block from 4 to 6 stats (days, entries, countries, cities, distance, temp range)
- Added date_end-aware days calculation (uses header.date_end when available)
- Added cities dedup logic (seen_city_lower) matching Task 1 pattern
- Added temperature range computation (temp_min / temp_max)
- Added has_gpx boolean flag
- Distance label is conditional: km cycled (GPX) vs km roamed (no GPX)
- Stats note text is conditional to match distance mode
- Cycling button added to filter bar (only rendered when has_gpx)
- Cycling panel (7 stat blocks) added after stats block (hidden by default, toggled independently)
- Replaced old haversine IIFE with unified haversineKm + parseGpxFiles + IIFE
- GPX Mode A: fetches GPX files, sums trackpoint distances, populates cycling panel
- GPX Mode B: haversine between entry GPS points (no GPX)
- Updated .trip-stats-grid from repeat(4) to repeat(3) columns
- Added .trip-cycling-block, .trip-cycling-header, .trip-cycling-icon, .trip-cycling-title, .trip-cycling-grid CSS
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WPJztrVGbwic2xTG7G9fjM
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