Add comprehensive error handling to update_energy_sensors

[nvmassen]

Changes

This PR adds comprehensive error handling to to improve robustness and reliability.

Error Handling Improvements

• Sensor state validation: Check for , , and states before processing
• Safe type conversions: Wrap all float conversions in try/except blocks
• HTTP error handling: Add timeout (10s) and exception handling for gas price scraping
• Web scraping validation: Validate BeautifulSoup results before accessing
• Improved logging: Use WARNING and ERROR log levels with specific error messages

Functions Updated

• ✅ - Validate daily price sensor state
• ✅ - Validate all 4 tariff sensors with detailed error messages
• ✅ - Wrap entire monthly rollover logic
• ✅ - Validate P1 meter sensor state
• ✅ - Validate electricity delivery sensor
• ✅ - Add HTTP timeout + request exception handling + parsing validation
• ✅ - Wrap MQTT telegram parsing
• ✅ - Add error handling for manual sensor updates

Benefits

• Prevents crashes when sensors are unavailable
• Provides clear error messages in logs for debugging
• Continues operation when individual sensors fail
• Better resilience during HA restarts or sensor outages