Add watt-second as unit of energy

[juame]

Proposed change

Documents the addition of Ws as a unit for energy.

Type of change

• Document existing features within Home Assistant
• Document new or changing features for which there is an existing pull request elsewhere
• Spelling or grammatical corrections, or rewording for improved clarity
• Changes to the backend of this documentation
• Remove stale or deprecated documentation

Checklist

• I have read and followed the documentation guidelines.
• I have verified that my changes render correctly in the documentation.

Additional information

• This PR fixes or closes issue: fixes #
• Link to relevant existing code or pull request: Add Ws as unit of energy core#156398

Summary by CodeRabbit

• Documentation
  • Updated supported units for ENERGY and ENERGY_STORAGE device classes to include watt-second (Ws) for both number and sensor entity types.

[coderabbitai]

📝 Walkthrough

Walkthrough

Documentation updates to device class unit lists for NumberDeviceClass and SensorDeviceClass to include Ws (watt-second) as a valid unit for ENERGY and ENERGY_STORAGE device classes.

Changes

Cohort / File(s)	Summary
Device class unit documentation updates docs/core/entity/number.md, docs/core/entity/sensor.md	Added Ws (watt-second) to valid units for ENERGY and ENERGY_STORAGE device classes in documentation reference tables

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Pre-merge checks and finishing touches

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The pull request description follows the template structure with a clear proposed change and appropriate type of change selected, but lacks evidence of required verification steps.	The author should confirm whether they have read the documentation guidelines and verified the changes render correctly, as indicated by the unchecked checklist items. Please mark these verification checkboxes as completed or provide confirmation.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding watt-second as an energy unit, which is directly reflected in the documentation updates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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