Community Geolocation Migration

Use a two-phase migration:

1. Bootstrap safely to /compat so the app stops depending on @react-native-community/geolocation.
2. Refactor from /compat to the Modern API best-practice shape.

Do not start by hand-converting every callback call site. First make the mechanical package/import migration small and reversible, verify it, then do the semantic Modern API refactor.

Workflow