Humidity: add condition (Labs feature)

[c0ffeeca7]

Proposed change

Humidity: add purpose-specific condition (Labs feature)

• targeting current branch as feature was added in a past release
• related to humidity triggers & conditions #44917

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Rename humidity.value condition to humidity.is_value core#166372, Add humidity condition core#166358
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #humidity triggers & conditions #44917

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[home-assistant]

It seems that this PR is targeted against an incorrect branch since it has a parent PR on one of our codebases. Documentation that needs to be updated for an upcoming release should target the next branch. Please change the target branch of this PR to next and rebase if needed.

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[Copilot]

Pull request overview

Adds documentation for the new purpose-specific Humidity condition (Labs feature) and updates the Humidity integration page to surface conditions.

Changes:

• Update the Humidity integration page wording to mention conditions and include the conditions list.
• Add a new condition reference page for humidity.is_value (“Relative humidity”) with UI steps and YAML examples.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
source/_integrations/humidity.markdown	Updates integration description and adds an include to list documented humidity conditions.
source/_conditions/humidity.is_value.markdown	New condition documentation page for humidity.is_value, including UI walkthrough, YAML options, and examples.