Add three new optional callbacks to CalProvider that enable users to react during the access token refresh lifecycle:
- onTokenRefreshStart: Called when token refresh begins
- onTokenRefreshSuccess: Called when token refresh succeeds
- onTokenRefreshError: Called when token refresh fails with error message
These callbacks are invoked in both token refresh locations:
1. Response interceptor (when API returns 498 status)
2. Initial access token validation
The callbacks are properly passed through the component hierarchy:
CalProvider -> BaseCalProvider -> useOAuthFlow hook
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Rajiv Sahal <sahalrajiv-extc@atharvacoe.ac.in>
