supabase / supabase / 41671285298 / 1 – studio-tests

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refactor(studio): rename ResponseError to StudioError (#52707)

## What

Moves the `ResponseError` class (`types/base.ts`) and the classified
error classes (`types/api-errors.ts`) into
`lib/errors/studio-errors.ts`, and renames `ResponseError` to
`StudioError`.

## Why

Studio's error classification is being expanded to cover errors that
don't come from API responses (thrown network failures, aborted
requests, unexpected client errors). The API-specific name and location
no longer fit. Landing the rename on its own keeps the follow-up PR,
which introduces the classified error model, small and reviewable.

## Notes for reviewers

- Mechanical change, no behavior change. Most of the diff is a one-line
import change per file plus import re-sorting by Prettier.
- Files that only use the type now use `import type { StudioError }`.
- `ResponseError` is no longer re-exported from `@/types`; there are no
compatibility shims at the old paths.
- Unrelated identifiers like `QueryResponseError` and
`parseResponseErrors` are unchanged.

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