Remove the environment indirections (#7089)

* Use raw underlying globals for environment

* Set dev EXPO_PUBLIC_ENV by exclusion

app.config.js

@@ -15,9 +15,9 @@ module.exports = function (config) {
    */
   const PLATFORM = process.env.EAS_BUILD_PLATFORM
 
-  const IS_DEV = process.env.EXPO_PUBLIC_ENV === 'development'
   const IS_TESTFLIGHT = process.env.EXPO_PUBLIC_ENV === 'testflight'
   const IS_PRODUCTION = process.env.EXPO_PUBLIC_ENV === 'production'
+  const IS_DEV = !IS_TESTFLIGHT || !IS_PRODUCTION
 
   const ASSOCIATED_DOMAINS = [
     'applinks:bsky.app',