Alan-Jowett / sonde / 24867461023

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Add transient modem display command for headless login prompts (#804)

* admin: add transient modem display command

Add a gateway admin RPC and sonde-admin subcommand for showing a transient 1-4 line message on the modem display for 60 seconds.

This keeps text rendering in the gateway, shares the existing display ownership and restore state, and restores the normal banner after the timeout. It supports headless flows such as Azure device login prompts.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* gateway: address PR review feedback

Restore the gateway banner if the first admin display transfer fails after taking display ownership, add regression coverage for that path, and apply the accepted follow-up cleanup from review.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* gateway: tighten admin display restore

Avoid extending modem transport lifetime from the admin display restore task and use a distinct error for missing BLE controller wiring.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* tests: bound paused-time modem waits

Use a wall-clock deadline in the mock modem read helper so paused Tokio time does not turn missing modem messages into hung admin display tests.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* gateway: tighten display review follow-ups

Reuse the wrapping-safe display generation helper in gateway banner restore schedulers and replace the paused-time test timeout spin loop with a wall-clock timeout helper.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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