Squeezebox: provide player sensor for next alarm timestamp

[wollew]

Proposed change

This PR provides a player sensor with the time stamp of the next scheduled alarm for this player. It is a follow-up to #154491 which provides binary sensors for player alarms.

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: fixes #
• This PR is related to issue: Add Squeezebox binary sensors for player alarm status #154491
• Link to documentation pull request: Squeezebox: Doc for new alarm time sensor home-assistant.io#41608
• 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.
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• 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.

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

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• New or updated dependencies have been added to requirements_all.txt.
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[home-assistant]

Hey there @rajlaud, @pssc, @peteS-UK, mind taking a look at this pull request as it has been labeled with an integration (squeezebox) you are listed as a code owner for? Thanks!

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[Copilot]

Pull Request Overview

This PR adds player-level alarm sensors to the Squeezebox integration, complementing the existing server-level sensors. The new functionality includes three binary sensors for alarm states (active, snoozed, upcoming) and one timestamp sensor for the next scheduled alarm time.

Key changes:

• Added player-based alarm sensors (binary sensors for alarm states and timestamp sensor for next alarm)
• Refactored test setup to use platform-specific fixtures reducing code duplication
• Introduced new sensor entity classes that follow the existing SqueezeboxEntity pattern

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
homeassistant/components/squeezebox/sensor.py	Added player alarm timestamp sensor entity class and setup logic
homeassistant/components/squeezebox/binary_sensor.py	Added player alarm binary sensor entities for active, snoozed, and upcoming states
homeassistant/components/squeezebox/const.py	Added constants for new player alarm sensor keys
homeassistant/components/squeezebox/strings.json	Added translation keys for the new alarm sensor entities
tests/components/squeezebox/test_sensor.py	Added test coverage for player alarm sensor and refactored test structure
tests/components/squeezebox/test_binary_sensor.py	Added comprehensive tests for player alarm binary sensors
tests/components/squeezebox/test_switch.py	Fixed incorrect docstring describing media_player instead of switch
tests/components/squeezebox/conftest.py	Added alarm-related mock attributes to test player fixture