Fix is_closed state for SlidingDiscreteGateWithPedestrianPosition covers in Overkiz

[iMicknl]

Proposed change

The #141330 refactor caused unintended side effects for the SlidingDiscreteGateWithPedestrianPosition cover.

Add a widget override for SlidingDiscreteGateWithPedestrianPosition so it reads core:OpenClosedPedestrianState instead of falling through to the UIClass.GATE default (core:OpenClosedState), which this device does not report.

Also adds a fixture and test coverage for the io:SlidingDiscreteGateOpenerIOComponent device (Somfy Elixo 3S io).

Fixes #170259

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 Gate/SlidingDiscreteGateWithPedestrianPosition after 2026.5.1 in Overkiz #170259
• 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 incorrect is_closed reporting for Overkiz SlidingDiscreteGateWithPedestrianPosition covers by applying a widget-specific override so the entity reads core:OpenClosedPedestrianState (instead of falling back to the UIClass.GATE default core:OpenClosedState).

Changes:

• Add a UIWidget.SLIDING_DISCRETE_GATE_WITH_PEDESTRIAN_POSITION cover description override to use OverkizState.CORE_OPEN_CLOSED_PEDESTRIAN for is_closed.
• Extend Overkiz cover service-action tests to cover the sliding discrete gate device.
• Add a real-device fixture entry (Somfy Elixo 3S io) and update snapshots impacted by the new fixture device/entities.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
homeassistant/components/overkiz/cover.py	Adds widget-level cover description override so is_closed reads the correct Overkiz state for sliding discrete gates with pedestrian position.
tests/components/overkiz/test_cover.py	Adds a sliding gate fixture and includes it in cover open/close/stop service-action coverage.
tests/components/overkiz/fixtures/setup/cloud_somfy_tahoma_v2_europe.json	Adds fixture data for an io:SlidingDiscreteGateOpenerIOComponent using SlidingDiscreteGateWithPedestrianPosition.
tests/components/overkiz/snapshots/test_cover.ambr	Updates snapshot to include the new cover.sliding_gate entity/state (including is_closed).
tests/components/overkiz/snapshots/test_button.ambr	Updates snapshot to include the new identify button entity created for the added fixture device.