Add fan entity for air conditioner to Home Connect

[Diegorro98]

Proposed change

Add fan entity to control the fan of an air conditioner from the Home Connect integration
It allows to:

• Set the fan speed
• Set the fan mode

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 #
• This PR is related to issue:
• Link to documentation pull request: Add air conditioner fan entity home-assistant.io#41653
• 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.
• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.

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[home-assistant]

Hey there @DavidMStraub, @MartinHjelmare, mind taking a look at this pull request as it has been labeled with an integration (home_connect) you are listed as a code owner for? Thanks!

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[Copilot]

Pull Request Overview

This PR adds fan entity support for Home Connect air conditioner devices, enabling control of fan speed mode (automatic/manual) and fan speed percentage through Home Assistant's fan platform.

• Implements a new HomeConnectAirConditioningFanEntity with support for preset modes and speed percentage control
• Adds comprehensive test coverage for fan entities including device pairing/unpairing, connection states, and feature detection
• Integrates air conditioner programs and fixtures to support testing

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
homeassistant/components/home_connect/fan.py	New fan platform implementation with dynamic entity creation based on available options, supporting both preset modes and speed percentage control
homeassistant/components/home_connect/init.py	Adds Platform.FAN to the list of supported platforms
homeassistant/components/home_connect/const.py	Adds FAN_SPEED_MODE_OPTIONS mapping and includes "AirConditioner" in APPLIANCES_WITH_PROGRAMS
homeassistant/components/home_connect/strings.json	Adds translation keys for fan preset modes (auto/manual)
tests/components/home_connect/test_fan.py	Comprehensive test suite covering device lifecycle, availability, speed/preset mode functionality, error handling, and dynamic entity creation
tests/components/home_connect/conftest.py	Refactors test fixtures to extract _get_set_program_option_side_effect function for better code reuse
tests/components/home_connect/fixtures/appliances.json	Adds air conditioner test appliance fixture
tests/components/home_connect/fixtures/programs.json	Adds air conditioner programs fixture data
tests/components/home_connect/snapshots/test_diagnostics.ambr	Updates diagnostics snapshot to include air conditioner test data

[emontnemery]

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