feat(hikes): SBB-style public-transport journey planner for hike prose

Add JourneyPlanner.svelte: a "Von / Nach" connections widget to drop into a
hike's prose (e.g. with a fixed trailhead destination) so readers can plan
the trip there by public transport. Backed by the free Swiss transport API
(transport.opendata.ch — the same one sbb-tui uses).

- From/To fields: prefillable + per-field lockable (fromFixed / toFixed),
  swap when both editable, and "Aktueller Standort" via geolocation
  (coarse accuracy → fast on laptops; resolves to the nearest stop).
- Station typeahead on both fields via /locations?type=station, so routes
  start/end at canonical stops instead of fuzzy-geocoded points (which was
  yielding roundabout connections); plus resolve-on-search fallback. The
  dropdown grows flush from the field as a route-line spur (matching dots),
  typed text highlighted.
- Separate date + time controls: date defaults to the next weekend day
  (Sat on weekdays, Sun on a Saturday); time + departure/arrival target are
  author-settable props (time="08:00" target="arrival") and reader-editable.
- Results: per-leg transport-type icons (bus/train/tram/ship/cable) and an
  expandable full itinerary (stations, times, platforms, line + direction,
  coloured rails, walk connectors); link to the full search.ch timetable.

Add TimePicker.svelte: a shared pill time picker (HH:MM string, chevron
nudges, hour/minute dropdown) in the same language as DatePicker /
DateTimePicker.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.83.0",
+	"version": "1.84.0",
 	"private": true,
 	"type": "module",
 	"scripts": {