Sergei 9ceb20c4fa Fix BLE test failures in cleanup, bulk, and concurrent tests
- Add missing addEventListener/removeEventListener mocks in BLEContext cleanup tests
- Fix scanning simulation by calling scanDevices() instead of trying to set state directly
- Add explicit timeouts to bulkSetWiFi tests (10-15s) to accommodate MockBLEManager delays
- Update concurrent connection error message check to match actual error text

All 42 BLE tests now pass (36 bulk/concurrent + 6 cleanup)
2026-02-01 11:18:34 -08:00
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