Beta and Production Builds in Expo - Fully Local, No EAS Required

Short summary

Use Expo's prebuild with APP_VARIANT environment variables to generate separate native projects for beta and production builds with distinct bundle identifiers. This provides OS-level isolation (separate keychain, storage, push tokens) preventing production data leakage, and enables QA to install and test both variants side-by-side on the same device.

• •Set APP_VARIANT env var in app.config.ts to generate different bundle IDs for beta vs production
• •OS-level namespace isolation guarantees no production data leakage via keychain or AsyncStorage
• •Both apps coexist on one device for rapid QA comparison without uninstall cycles

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