ASA: Order of Map Layers

**Describe the task**
The ASA map currently layers the HFI grid on top of all other layers. As a result, the fire zone boundaries, linear features and labels cannot be seen.

**Acceptance Criteria**
- [ ] Labels should be the top layer displayed on the map - they should never be covered up by another map layer.
- [ ] Fire Centre and Zone boundaries should be second.
- [ ] HFI grid cells should be fifth.
- [ ] Polygon fill for advisory/warning areas should be fourth.
- [ ] Base map should be on the bottom.

**Additional context**
- UX Review

Start with the ASA map's layer configuration and identify the existing entries for labels, Fire Centre and Zone boundaries, HFI grid cells, advisory/warning polygons, and the base map. Reorder them to match the acceptance criteria, then verify visually that labels remain on top and the base map remains underneath all other layers.

Written by the indexing model from the issue text.