Switch API environment to DEV and add Google Sign-In localization strings

- Change ApiConfig.CURRENT_ENV from LOCAL to DEV
- Add "Google Sign-In Error" and "Sign in with Google" to Localizable.xcstrings
- Reorder Xcode project build settings (cosmetic)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

composeApp/src/commonMain/kotlin/com/example/casera/network/ApiConfig.kt

@@ -9,7 +9,7 @@ package com.example.casera.network
  */
 object ApiConfig {
     // ⚠️ CHANGE THIS TO TOGGLE ENVIRONMENT ⚠️
-    val CURRENT_ENV = Environment.LOCAL
+    val CURRENT_ENV = Environment.DEV
 
     enum class Environment {
         LOCAL,