fix: ensure language is initialized on app startup and applied before navigating to privacy screen

[pradhyumna186]

… navigation

Issues Fixed:

1. App never reads saved language preference on startup
2. Race condition: app navigates before locale change is applied

Solution:

• Root.kt: Call applyCurrentLanguage() in startup LaunchedEffect
• LanguageSelectScreen.kt: Use LanguageSwitcher.languageChangeComplete StateFlow to wait for language change before navigating

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Fixes #<1270> 🦕

[github-actions]

✅ Thanks @pradhyumna186 — required media detected. Nothing more needed here!