Bug/sensors unavailable

[derolli1976]

Description

Added a configurable HTTP timeout setting for the Enpal Box data scraping endpoint. The timeout was previously hardcoded to 30 seconds in sensor.py. It is now exposed as a user-configurable option (range: 10–120 seconds) in both the initial setup flow and the options flow, with full DE/EN translations.

Changed files:

• const.py – New constant DEFAULT_TIMEOUT = 30
• sensor.py – Reads timeout from config entry options instead of using a hardcoded value
• config_flow.py – Added timeout field to setup step, options flow, and all related schemas/processing
• translations/en.json – English label for timeout field
• translations/de.json – German label for timeout field
• manifest.json – Version bump to 2.3.1

Motivation and Context

Users with slow Enpal Box web interfaces frequently experienced sensors switching to "Unavailable" because the hardcoded 30-second HTTP timeout was exceeded. This is especially common on first-generation Enpal boxes under load. By making the timeout configurable, users can increase it (e.g. to 60–90s) to avoid transient unavailability without requiring a code change.

How Has This Been Tested?

• Verified that existing tests still pass (no regressions in parsing or entity logic)
• Validated that config_flow.py, const.py, and sensor.py have no lint/type errors
• Confirmed backward compatibility: existing installations without a timeout option fall back to DEFAULT_TIMEOUT = 30
• Validated voluptuous schema enforces the allowed range (min=10, max=120)

Screenshots (if appropriate):

N/A — UI change is a single additional integer input field in the configuration/options dialog.

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.