Addresses #242. The Select component renders with value={undefined}
before useEffect populates editedTemplate.type. This triggers a React
warning: 'Select is changing from uncontrolled to controlled.'
On the hosted environment, this likely causes Radix UI's data-placeholder
attribute to remain set on the trigger, with the selected value text
not being rendered despite the value being loaded in state.
This change extends the loading condition to wait for editedTemplate.type,
ensuring the Select never renders in an undefined/uncontrolled state.
Dries Augustyns