fix(utils): handle case-insensitive enum values in getFromLookupByValue

[UrbanZan]

Problem

Some Sonoff TH sensors (SNZB-02D, SNZB-02LD, SNZB-02WD, SNZB-02DR2) with newer firmware (v8960+) send temperature_units as "Celsius" or "Fahrenheit" (capitalized) instead of "celsius" or "fahrenheit" (lowercase).

This causes Home Assistant to reject the value with an error like:

Invalid option for select.office_th_sensor_temperature_units: 'Celsius' (valid options: ['celsius', 'fahrenheit'])

Solution

Added a case-insensitive key matching fallback in getFromLookupByValue(). When the device sends a string value that doesn't match any lookup value exactly, the function now checks if the string matches any lookup key case-insensitively and returns the correctly-cased key.

• Device sends "Celsius" → returns "celsius" ✅
• Device sends "Fahrenheit" → returns "fahrenheit" ✅

Affected Devices

• Sonoff SNZB-02D
• Sonoff SNZB-02LD
• Sonoff SNZB-02WD
• Sonoff SNZB-02DR2

Testing

The fix is backward compatible - existing numeric value handling remains unchanged.

[Koenkk]

It should always use celsius and never Celsius, this should be fixed after changing it once.