Fix is_closed state for DiscretePositionableGarageDoor in Overkiz

[iMicknl]

Proposed change

Fix cover state for Somfy Rollixo IO (DiscretePositionableGarageDoor widget) which reports core:OpenClosedUnknownState instead of core:OpenClosedState and does not support position control.

After the cover platform migration to entity descriptions (#141330), this device falls through to the UIClass.GARAGE_DOOR default which looks for core:OpenClosedState and core:ClosureState — neither of which exist on this device. This causes the cover to always show as "unknown" state.

The fix adds a widget-specific override for UIWidget.DISCRETE_POSITIONABLE_GARAGE_DOOR that uses the correct CORE_OPEN_CLOSED_UNKNOWN state and omits position control (which this device doesn't support).

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 is_closed state is unknown for DiscretePositionableGarageDoor after 2026.5 in Overkiz #170966
• 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.
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• Tests have been added to verify that the new code works.
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[Copilot]

Pull request overview

Fixes the Overkiz cover entity mapping for Somfy Rollixo IO devices using the DiscretePositionableGarageDoor widget so the entity reports a correct is_closed state (and does not expose unsupported position control) after the cover platform migration to entity descriptions.

Changes:

• Add a widget-specific OverkizCoverDescription for UIWidget.DISCRETE_POSITIONABLE_GARAGE_DOOR using core:OpenClosedUnknownState.
• Extend the Overkiz cover service-action tests to include the discrete garage door device.
• Update the local TaHoma fixture and snapshot to include and validate the new device behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
homeassistant/components/overkiz/cover.py	Adds a widget-specific override so is_closed is derived from CORE_OPEN_CLOSED_UNKNOWN and position support is not enabled.
tests/components/overkiz/test_cover.py	Adds the discrete garage door fixture device to service-action test coverage (open/close/stop).
tests/components/overkiz/snapshots/test_cover.ambr	Updates snapshots to include the new entity registry entry/state for the added device.
tests/components/overkiz/fixtures/setup/local_somfy_tahoma_v2_europe.json	Adds a representative DiscretePositionableGarageDoor device payload to reproduce/validate the issue.