Add target_humidity_step to humidifier

[LG-ThinQ-Integration]

Proposed change

Add attribute "target_humidity_step" to humidifier.

Type of change

• Document existing features within Home Assistant
• Document new or changing features for which there is an existing pull request elsewhere
• Spelling or grammatical corrections, or rewording for improved clarity
• Changes to the backend of this documentation
• Remove stale or deprecated documentation

Checklist

• I have read and followed the documentation guidelines.
• I have verified that my changes render correctly in the documentation.

Additional information

• This PR fixes or closes issue: fixes #
• Link to relevant existing code or pull request: Add target_humidity_step attribute to humidifier core#156906

Summary by CodeRabbit

• Documentation
  • Added documentation for a new step size property on the humidifier entity, defining the increment used when adjusting target humidity levels.

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[coderabbitai]

📝 Walkthrough

Walkthrough

A documentation file was updated to add information about a new target_humidity_step property for the humidifier entity, describing it as an optional float field with default None representing the step size for adjusting target humidity.

Changes

Cohort / File(s)	Summary
Humidifier entity documentation docs/core/entity/humidifier.md	Added target_humidity_step property documentation as an optional float field with default None describing humidity adjustment step size.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Pre-merge checks and finishing touches

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description follows the template structure with Proposed change and Type of change sections completed. However, critical checklist items are unchecked and the Additional information section is incomplete.	Check the documentation guidelines and render verification boxes in the checklist, and complete any missing critical information to ensure compliance with contribution requirements.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding the target_humidity_step property to the humidifier documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

Cache: Disabled due to data retention organization setting

Knowledge base: Disabled due to data retention organization setting

📥 Commits

Reviewing files that changed from the base of the PR and between d0422cc and 0b0f2c8.

📒 Files selected for processing (1)

• docs/core/entity/humidifier.md (1 hunks)

🔇 Additional comments (1)

docs/core/entity/humidifier.md (1)

25-25: Documentation is accurate and requires no changes.

The core PR implementation confirms the type annotation float | None with default value None, which matches the documentation exactly. The description accurately reflects the property's purpose for frontend humidity control step customization.

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[Copilot]

Pull Request Overview

This PR adds documentation for the new target_humidity_step property to the humidifier entity, which defines the increment/decrement step size for adjusting target humidity levels.

Key Changes:

• Added target_humidity_step property documentation to the humidifier entity properties table

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