Support KNX scene entity configuration from UI

[farmio]

Proposed change

Support KNX scene entity configuration from UI

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:
• Link to documentation pull request: Support KNX scene entity configuration from UI home-assistant.io#42664
• 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 link to the changelog, or at minimum a diff between library versions 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 @Julius2342, @marvin-w, mind taking a look at this pull request as it has been labeled with an integration (knx) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

This PR adds UI configuration support for KNX scene entities, enabling users to create and manage scene entities through the Home Assistant UI instead of only through YAML configuration.

Key changes:

• Refactored scene entity classes to support both YAML and UI configuration patterns
• Added scene entity schema and validation for UI-based configuration
• Implemented comprehensive test coverage for UI entity creation and loading

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
homeassistant/components/knx/scene.py	Refactored entity classes: split original KNXScene into base _KnxScene, KnxYamlScene for YAML config, and new KnxUiScene for UI config; updated async_setup_entry to handle both configuration sources
homeassistant/components/knx/const.py	Added SceneConf class with SCENE_NUMBER constant and added Platform.SCENE to SUPPORTED_PLATFORMS_UI set
homeassistant/components/knx/schema.py	Updated YAML schema to use SceneConf.SCENE_NUMBER constant for consistency with other platforms
homeassistant/components/knx/storage/const.py	Added CONF_GA_SCENE constant for scene group address storage key
homeassistant/components/knx/storage/entity_store_schema.py	Added SCENE_KNX_SCHEMA with validation for scene group address and scene number (1-64 range)
homeassistant/components/knx/strings.json	Added user-facing text for scene entity configuration including descriptions and labels for group address and scene number fields
tests/components/knx/test_scene.py	Added test_scene_ui_create and test_scene_ui_load tests to verify UI entity creation and storage loading functionality
tests/components/knx/fixtures/config_store_scene.json	Added test fixture with scene configuration data for storage loading tests
tests/components/knx/snapshots/test_websocket.ambr	Added snapshot test data for scene entity schema validation via websocket API