feat: add retry mechanism for failed API requests

[Nandini868686]

📌 Description

This PR adds automatic retry handling for transient API failures, improving reliability when the backend is temporarily unavailable (e.g., Render cold starts).

🔗 Related Issue

Closes #1440

🛠 Changes Made

• Added axios-retry dependency.
• Configured automatic retries for network errors and 5xx server errors.
• Added exponential backoff delay between retry attempts.
• Preserved existing timeout and network error handling.
• Verified production build succeeds.

📸 Screenshots (if applicable)

N/A (No UI changes)

✅ Checklist

• [✓ ] Code runs locally
• [✓ ] Followed project structure
• No console errors
• Properly tested changes
• [✓ ] Linked the issue

🚀 Notes for Reviewers

Implemented retry handling using axios-retry with exponential backoff. Retries are triggered for network errors and 5xx responses while preserving existing timeout and error handling logic.