OAuth Token Expiration Handling for Usage Data

What: The API usage data fetcher now checks if the OAuth token is expiring before making API calls, gracefully falling back to cached data instead of throwing errors.

Details:

• Previously, the usage data fetch (VPA() at line 471623) would attempt API calls even with expiring tokens, potentially causing "Failed to load usage data" errors
• Now checks if token expires within 5 minutes and returns null immediately if so
• Falls back to cached usage data rather than displaying errors during token refresh windows
• Evidence: VPA() at line 471623-471636 in v2.0.53, new check using W6() (OAuth token getter at line 163812) and Ym() (expiration checker at line 67497)

User impact: Fewer transient error messages when viewing API usage near token expiration times.