Implement connected flow tests that verify end-to-end interaction with a real, already-paired TNC.

[mobilinkd]

Implement connected flow tests that verify end-to-end interaction with a real, already-paired TNC.

Test cases

6. testScanFindsTnc() — tap Scan, wait for device list, assert cell exists
7. testConnectToTnc() — tap device cell, tap Connect, assert menu screen
8. testReadTxDelay() — navigate to TX Delay, assert value label non-empty
9. testChangeTxDelay() — move slider, tap Save, assert success
10. testReadModemConfig() — navigate to Modem Config, assert type label non-empty
11. testChangeModemType() — select picker row, tap Save, assert success
12. testReadBattery() — navigate to Power, assert battery label non-empty
13. testReadFirmwareVersion() — navigate to TNC Info, assert version label non-empty
14. testDisconnect() — tap Disconnect, assert scan screen reappears

Prerequisites

• TNC is on and advertising
• TNC is already paired/bonded in iOS Settings
• Bluetooth is enabled on phone

Requirements

• Needs accessibilityIdentifiers from Add accessibilityIdentifier strings to all interactive UI elements #13
• Needs test target from Add accessibilityIdentifier to every interactive UI element in the storyboard and Swift code so XCUITest can locate them reliably. #14

Acceptance criteria

• All tests pass with TNC present and paired
• Tests use waitForExistence(timeout: 15) for BLE scan timing
• Failed tests capture automatic screenshots

Parent: #12

• Depends on: Add accessibilityIdentifier strings to all interactive UI elements #13, Add accessibilityIdentifier to every interactive UI element in the storyboard and Swift code so XCUITest can locate them reliably. #14