Pooldose: add number platform

[lmaertin]

Breaking change

Proposed change

Add number platform:

• pH target: Target pH value for automatic dosing control.
• ORP target: Target ORP (Redox) value for automatic dosing control.
• Chlorine target: Target chlorine concentration for automatic dosing control.
• pH overfeed alarm lower limit: Lower threshold for pH overfeed detection.
• pH overfeed alarm upper limit: Upper threshold for pH overfeed detection.
• ORP overfeed alarm lower limit: Lower threshold for ORP overfeed detection.
• ORP overfeed alarm upper limit: Upper threshold for ORP overfeed detection.
• Chlorine overfeed alarm lower limit: Lower threshold for chlorine overfeed detection.
• Chlorine overfeed alarm upper limit: Upper threshold for chlorine overfeed detection.

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: Pooldose Docs: add number platform home-assistant.io#42080
• 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 number platform to the Pooldose integration, enabling users to configure target values and overfeed alarm limits for pool chemistry parameters (pH, ORP, and chlorine). The implementation provides 9 configurable number entities that control the automatic dosing system.

Key Changes

• Added number platform with 3 target value entities and 6 overfeed alarm limit entities for pool chemistry control
• Implemented optimistic updates for immediate UI feedback when values are changed
• Comprehensive test coverage including snapshot tests, state changes, and unavailability scenarios

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
homeassistant/components/pooldose/init.py	Added Platform.NUMBER to PLATFORMS list to register the new number platform
homeassistant/components/pooldose/number.py	New implementation of number entities with coordinator-based updates and optimistic value setting
homeassistant/components/pooldose/strings.json	Added translation keys for all 9 number entities (targets and alarm limits)
homeassistant/components/pooldose/icons.json	Added appropriate icons for all 9 number entities
tests/components/pooldose/test_number.py	Comprehensive test suite covering entity creation, availability, state changes, value setting, and attributes
tests/components/pooldose/snapshots/test_number.ambr	Snapshot file containing expected entity registry and state data for all 9 number entities
tests/components/pooldose/fixtures/instantvalues.json	Added fixture data for all 9 number entities with appropriate value ranges and units

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