add switch platform to fressnapf_tracker

[eifinger]

Proposed change

German: Schlafmodus
Dutch: slaapmodus
French: le mode veille
Italian: la modalità notturna

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 switch platform to fressnapf_tracker home-assistant.io#42146
• 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.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[Copilot]

Pull request overview

This PR adds a switch platform to the fressnapf_tracker integration to control the energy saving (sleep mode) feature of GPS trackers. The switch entity is only created when the tracker supports energy saving mode, providing users with a configuration option to toggle this feature.

Key Changes

• New switch platform implementation that controls energy saving mode via the tracker API
• Comprehensive test coverage including entity creation, state snapshots, and turn on/off operations
• Translations and state-based icons for the sleep mode switch

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
homeassistant/components/fressnapf_tracker/switch.py	Implements the switch platform with energy saving control functionality
homeassistant/components/fressnapf_tracker/strings.json	Adds "Sleep mode" translation for the switch entity
homeassistant/components/fressnapf_tracker/icons.json	Adds state-based icons (sleep/sleep-off) for the switch
tests/components/fressnapf_tracker/test_switch.py	Adds comprehensive tests for switch entity creation and control
tests/components/fressnapf_tracker/snapshots/test_switch.ambr	Snapshot data for entity and state validation
tests/components/fressnapf_tracker/conftest.py	Updates mock tracker data to include energy saving feature