Sync Preferences + API Retry Handling

[VaibhaviShreya]

Problem:
1.Preferences are stored in chrome.storage.local, so users lose settings across devices.
2.Groq API calls fail silently on network/5xx errors — no retry, no user feedback.

Solution:
1.Preference Sync

• Use chrome.storage.sync with fallback to local on quota error.

• Cache fallback and optionally notify user.

  2.API Reliability

• Add retry with exponential backoff (2–3 attempts).

• Show user-friendly error or retry status.

Impact:

• Preferences persist across devices
• Transient errors no longer block translations
• Users stay informed when things go wrong

@byteom