App Bridge loading test harness

Manual start/stop

Calls loading(true) and loading(false) directly, one button each.

Simulated async action

loading(true), a ~1.5s delay, then loading(false) - the realistic fetch/save shape.

Overlapping calls

Two independent loading(true)-delay-loading(false) sequences (1s and 3s). Fire both close together and watch the log/bar - undocumented whether this behaves as a simple last-call-wins boolean or something smarter (e.g. a counter).

Left on across navigation

Starts loading and deliberately never stops it - navigate home and see whether the bar persists, gets cleared by App Bridge, or leaks.