Add network MAC connection to iAlarm device

[jasonjhofmann]

Proposed change

Register the iAlarm alarm panel with its network MAC address as a connection so the MAC is
shown on the device page and other integrations can attach to the same device.

The device was registered without any device connections, so Home Assistant did
not display the MAC on the device page, and integrations that key off the network
MAC (for example, the UniFi Network integration) created a separate device for the
same physical unit. Adding the CONNECTION_NETWORK_MAC connection fixes both: the
MAC now shows on the device page, and integrations referencing the same network
device link to it instead of producing a duplicate.

This is the same change applied to Aranet in #173066 and to AirVisual Pro in
#173071.

Please re-classify it as a Bugfix if deemed appropriate (as one could argue a
network device should always carry its network MAC connection).

The change is covered by a new device-registry snapshot test that asserts the
network MAC connection is registered.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue:
• This PR is related to issue:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies a diff between library versions and ideally a link to the changelog/release notes is added to the PR description.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[home-assistant]

Hey there @RyuzakiKK, mind taking a look at this pull request as it has been labeled with an integration (ialarm) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR adds a network MAC connection to the device registry entry for the iAlarm integration, improving device identification and enabling Home Assistant to better track the device via its MAC address.

Changes:

• Added CONNECTION_NETWORK_MAC and format_mac to the DeviceInfo in alarm_control_panel.py to register the MAC as a device connection.
• Added a new test_device_registry test to verify the device registry entry including the MAC connection.
• Added a corresponding snapshot file for the new test.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
homeassistant/components/ialarm/alarm_control_panel.py	Adds MAC connection to DeviceInfo using format_mac
tests/components/ialarm/test_init.py	Adds test verifying the device registry entry with MAC connection
tests/components/ialarm/snapshots/test_init.ambr	Snapshot for the new device registry test