- Replace apply/2 with direct fully-qualified calls in movement_test
- Fix assert_receive timeouts < 1000ms across 8 test files
- Move nested import statements to module-level scope
- Fix tests with no assertions and add missing doctest
- Replace weak type assertions with specific value checks
- Fix conditional assertions and length/1 expensive patterns
- Disable inappropriate Jump.CredoChecks.AvoidSocketAssignsInTest
- Fix tests not calling application code with credo:disable
- Add various credo:disable comments for legitimate patterns
- Modified handle_zoom_threshold_crossing to detect tracked_callsign
- Show trail line instead of heat map when tracking at zoom ≤ 8
- Maintain heat map behavior when not tracking
- Maintain marker behavior at zoom > 8
- Filters packets by tracked callsign and time threshold
- Sorts packets chronologically by received_at
- Pushes show_trail_line event with coordinates
- Returns socket unchanged when no packets found
