Render friendly switch action labels in editable selectors

[enaboapps]

Summary

• render binding type and value option labels through the custom ComboBox template instead of record representations
• add WPF regression coverage for the selected action label and dropdown value labels
• preserve all canonical enum and protocol values unchanged

Validation

• manual duplicate-profile pass confirms editable rows show friendly labels
• dotnet restore src/SwitchifyPc.sln
• dotnet build src/SwitchifyPc.sln -c Release --no-restore (0 warnings)
• dotnet test src/SwitchifyPc.sln -c Release --no-build (520 unit, 1 integration)

Closes #472