- Fix unsubscribe_from_bounds -> unsubscribe (function doesn't exist)
- Fix search_callsign query to use 'lon' instead of 'lng' field
- Add comprehensive test suite for mobile channel:
- Join and subscription tests
- Bounds validation tests
- Callsign search tests
- Callsign tracking tests
- Streaming packet tests
- Packet data format tests
- 29 tests total, all passing
Created test/support/channel_case.ex for channel testing infrastructure.
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