Move avatar initials, fallback styling, and loading/loading-state UI
into ProfilePicture and update components to use it. Export
ProfilePicture from the lib index.
- added tailwindcss with shadcn-svelte sonner toasts
- added a location store and a geolation util to find, watch, use and
store locations and their updates
- added a LocationButton to navigate to the current location and handle
errors.
- updated the Map to use LocationButton and go to current location.
