Document Watts Vision + preset modes, HVAC action, and timer mode action

[theobld-ww]

Proposed change

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: Watts hvac preset timer core#169546
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

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.

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[Copilot]

Pull request overview

This PR updates the Watts Vision + integration documentation to cover newly exposed climate capabilities and the new timer-mode action, aligning the docs with the related Home Assistant Core feature work.

Changes:

• Documented HVAC action and preset modes for Watts Vision + climate entities.
• Added an Actions section describing the watts.activate_timer_mode action, including an example.
• Added a Known limitations note about how BRT-WR02-RF devices paired as heaters are represented.