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fix(studio): pre-empt React 19 regressions in tests + Support form (#45784)

Four React-19-sensitive patterns that pass on React 18 today but break
under React 19 (verified on the in-flight TanStack Start branch).
Landing on master now so the eventual React 19 upgrade is a no-op for
tests, instead of a separate cleanup pass under upgrade pressure.

Each fix is a strict superset / less-fragile equivalent of the existing
pattern, so master (React 18) stays green.

**Changed:**
- `hooks/misc/useStateTransition.ts` — fire on entry into `newTest` from
any state other than `newTest`, instead of requiring exactly `prevTest →
newTest`. React 18+ auto-batches dispatches across awaits (e.g.
`dispatch SUBMIT` in the handler, `dispatch ERROR` in `onError`),
collapsing `editing → submitting → error` into a single render where the
intermediate `submitting` tick is never observed. Strict superset of the
old check for our reducers — `success`/`error` are only reachable from
`submitting`.
- `Support/CategoryAndSeverityInfo.tsx` — guard `onValueChange` against
Radix Select's spurious `''` emission. When the controlled value
transitions from `undefined` to a defined value whose `SelectItem` isn't
mounted yet (dropdown closed → items haven't registered), Radix's hidden
`BubbleSelect` fires `onValueChange('')` and clobbers the field. No
`SelectItem` can have `value=""` (Radix throws), so any `''` is
guaranteed spurious — drop it before calling `field.onChange`.
([radix-ui/primitives#3381](https://github.com/radix-ui/primitives/issues/3381))
- `EditSecretModal.test.tsx` — `getByLabelText` → `findByLabelText`.
Under React 19's scheduling, the decrypted-value query resolves on a
separate render tick, so form fields appear one tick after the skeleton.
- `LogsPreviewer.test.tsx` — `addEventListener('click', spy)` instead of
`loadOlder.onclick = vi.fn()`. React 19 reassigns `.onclick` on managed
elements as part of its event wiring, clobbering the direct-property
spy.

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