fix(webapp): require explicit native button types (#4692)

## Summary

Add explicit types to native dashboard buttons and enforce
`react/button-has-type`.

This prevents action buttons from accidentally submitting a surrounding
form. Shared button primitives retain their caller-selected submit and
reset semantics with documented lint exceptions.

Base: [#4691](https://github.com/triggerdotdev/trigger.dev/pull/4691)