FireWatch: Show/select weather stations on map

**Describe the task**
The map should show the weather stations so a user can spatially select a weather station to use, rather than needing to type the name of it in.

**Acceptance Criteria**
- [ ] (Active?) Weather stations are visible and selectable on the map
- [ ] User still has the ability to type in weather station name if they want to

**Additional context**
- This will involve some reorganization of the input form steps

No files, tests, or entry points are named. Start by locating the existing weather-station name input and map form flow, then trace how station data reaches the map. Done means stations are visible and selectable spatially while typed station-name entry remains available, with the input steps reorganized as needed.

Written by the indexing model from the issue text.