56 bug verzoegerung bei bedienung der wallbox via integration

[derolli1976]

Add short delay before updating Wallbox sensors after API calls

Description

Added an asyncio.sleep() delay before triggering a homeassistant.update_entity call to ensure that the Wallbox has enough time to apply the new state before Home Assistant refreshes the sensor values.

The delay was introduced in:

• button.py
• select.py

A similar delay was already present in switch.py.

Motivation and Context

Without a short delay, Home Assistant sometimes refreshed the Wallbox sensor state too early, leading to inconsistent or outdated values in the UI.
This change ensures more reliable and consistent state updates after Wallbox API calls.

How Has This Been Tested?

• Tested locally with an Enpal Wallbox setup.
• Triggered changes via button, select, and switch entities.
• Verified that the sensor values update correctly after the delay and reflect the actual Wallbox state.
• No regressions observed in normal operation.

Screenshots (if appropriate):

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.