Two issues:
1) Menu list stutters. SwiftUI's Menu renders all rows in a
non-virtualized popover. With 30+ airlines and Buttons containing
Labels, scrolling jank starts immediately. Switched the airline +
type filters to a sheet-based picker (LiveFilterPicker) backed by
a real List — virtualized scrolling, plus a search bar that
filters as you type.
2) Type filter was non-functional because OpenSky's anonymous tier
returns ADS-B emitter category as null for most aircraft.
Replaced with a real type-code lookup: bundled aircraftDB.json
(1.5MB slimmed copy of OpenSky's aircraft metadata, 100k
commercial-class airframes, filtered to skip GA / gliders /
ultralights). AircraftDatabase.shared.typeCode(forICAO24:)
returns the ICAO type designator (B738, A21N, etc.).
AircraftDatabase.displayName(forTypeCode:) maps the top ~130
common codes to friendly names ("B738" → "Boeing 737-800").
LiveAircraft now exposes a `typeCode` computed property that
indexes into the DB. The type filter chip → sheet flow uses the
same LiveFilterPicker as airlines, with multi-select + counts +
search.
Both pickers keep the "Selected (N)" group pinned at the top so
the user always sees what they have active without scrolling.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Trey T
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