chore: Various form improvements

[johncowen]

1. XAction type="" > action="". Using type as a Vue level attribute clashes with HTMLs button type=""
2. Turn off the native bordering on fieldsets so we can start using them for disabling form sections entirely instead of disabling individual form elements. We also do this/make use of this now in the ZoneCreate form.
3. Slight amends to DataSink:
   • Never use the cache for writing operations, we don't want a cached result.
   • Ensure writing 'in-flight' prop is always reset back to false after a write operation

Note: the above DataSink amends aren't crucial for the functionality we already use, but for a future functionality they will be.

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