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/ios/sentry.properties

@@ -1,4 +1,4 @@
 defaults.url=https://sentry.io/
 defaults.org=molten-prints
 defaults.project=sauci
-# Using SENTRY_AUTH_TOKEN environment variable
+# auth.token is provided via SENTRY_AUTH_TOKEN environment variable