Fix EAS local builds and resolve require cycles

- Add dotenv-cli for EAS local builds to load env vars
- Break circular dependencies in store/hooks imports
- Add env var validation with clear error messages
- Remove hardcoded Sentry auth token from sentry.properties
- Add .ipa files to .gitignore

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/mobile/.gitignore

@@ -5,3 +5,4 @@
 expo-env.d.ts
 # @end expo-cli
 *.aab
+*.ipa