add mapbox gl option, gps location, journey reorder + polish

- Mapbox GL provider alongside Leaflet for trip and journey maps (opt-in in
  settings with token, style presets incl. 3D on satellite, quality mode,
  experimental badge).
- GPS "blue dot" with heading cone on mobile; three-state FAB (off / show /
  follow), geodesic accuracy circle, desktop-hidden since browser IP geo is
  too coarse for navigation.
- Marker drift fix: outer wrap no longer carries inline position/transform,
  so mapbox's translate keeps the pin pinned at every zoom and pitch.
- Journey map popup (mapbox-gl): Apple-Maps-style tooltip on marker
  highlight/click showing entry title + location / date subline.
- Journey feed reorder: up/down controls to the left of each entry reorder
  sort_order within a day. Server endpoint, optimistic store update, rollback
  on failure.
- Journey entry editor: desktop modal now centers over the feed column only,
  backdrop still blurs the whole page (map included).
- Scroll-sync guard on journey: marker click locks the sync so smooth-scroll
  can't steer the highlight to a neighbouring entry mid-animation.
- Misc: map top-padding aligned with hero, live/synced badges replaced by a
  compact back-button in the hero, skeleton entries no longer pollute the
  journey map, journey detail no longer shows map on mobile path when
  combined view is active.

client/src/api/client.ts

@@ -343,6 +343,7 @@ export const journeyApi = {
   createEntry: (id: number, data: Record<string, unknown>) => apiClient.post(`/journeys/${id}/entries`, data).then(r => r.data),
   updateEntry: (entryId: number, data: Record<string, unknown>) => apiClient.patch(`/journeys/entries/${entryId}`, data).then(r => r.data),
   deleteEntry: (entryId: number) => apiClient.delete(`/journeys/entries/${entryId}`).then(r => r.data),
+  reorderEntries: (journeyId: number, orderedIds: number[]) => apiClient.put(`/journeys/${journeyId}/entries/reorder`, { orderedIds }).then(r => r.data),
 
   // Photos
   uploadPhotos: (entryId: number, formData: FormData) => apiClient.post(`/journeys/entries/${entryId}/photos`, formData, { headers: { 'Content-Type': undefined as any } }).then(r => r.data),