- Created RateLimitIndicator component to display rate limit status
- Shows when user is rate limited or when remaining < 20% of limit
- Displays remaining requests (e.g., "50/100 requests")
- Shows countdown timer until reset (formatted as "5m 30s" or "1h 15m")
- Uses AlertTriangle and Clock icons from lucide-react
- Color-coded: red for critical (rate limited), gold for warning (< 20% remaining)
- Updates timer every second using useEffect
- Returns null when no rate limit data or not limited
- Follows existing component patterns (similar to OfflineIndicator)
- Action 5.4.1.2 complete
