Proposed change

The Squeezebox integration maintains a list of known apps and radios plugins on the LMS for each player. Currently, this list is built dynamically when it's used by the media browser. However, this will cause automations to fail if they try and use one of these apps before the media browser is used manually. This fix adds a async_added_to_hass to the media_player entity which calls a new function in the browse_data class, async_init, which initialises the list of known apps and radio plugins on startup.

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 Squeezebox integration does not sync with LMS on start-up #149701
• This PR is related to issue:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

• 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.

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

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  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.
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