Enhance aircraft type detection with proper ADS-B categories and visual differentiation
Replace hardcoded ICAO matches with standards-compliant ADS-B category parsing:
- Implement RTCA DO-260B weight-based categories (Light/Medium/Heavy/Super)
- Add helicopter, military, cargo, and GA aircraft type detection
- Create distinct SVG icons for each aircraft type (helicopter with rotor disc, swept-wing military, wide-body cargo, etc.)
- Enhanced callsign-based fallback classification
- Remove hardcoded aircraft 478058 helicopter detection per user feedback
- Support proper ADS-B category strings like "Medium 34000-136000kg"
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Co-Authored-By: Claude <noreply@anthropic.com>