- Add specific error handling for GitHub API rate limit (403) errors
- Create RateLimitError with proper error name for identification
- Store last sync error and error time in settings for UI display
- Add error status display in autosync settings modal
- Show user-friendly error messages with GitHub token suggestion
- Clear error status on successful sync
- Update both GitHubJsonService and GitHubService with rate limit error handling
This provides better user feedback when GitHub API rate limits are exceeded
and guides users to set up a GitHub token for higher rate limits.
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