- Remove CSS `bottom: 50px !important` on popups that pushed them too
high above markers
- Hide trails when markers are clustered (zoom < 11) so trails don't
point to invisible markers inside cluster bubbles
- Fix locate button overlap with zoom controls and keep it always
light mode
- Remove duplicate slideover/toggle CSS from layout files (single
source of truth in component)
- Remove dead CSS classes and standardize breakpoints to 1024px
- Add isDestroyed guards on async callbacks to prevent race conditions
- Escape callsigns in marker HTML to prevent XSS
- Replace Leaflet _container private API with getContainer()
- Clean up about page placeholder text
Graham McIntire
b8d2095346