supabase / supabase / 29854454208

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refactor(sql-editor): extract deriveSnippetIdentity, debug/completion/diff-key helpers (#48014)

## Summary
Pure-fn extraction pass across the SQL editor hooks.

- Extracts `deriveSnippetIdentity` out of `useSnippetIdentity`'s inline
id + `isLoading` derivation into `SQLEditor.utils.ts`.
- Extracts `extractDebugContext` (shared snippet/result/error
extraction) and `buildDebugChatArgs` (the `aiSnap.newChat(...)` payload
builder) out of `useSqlEditorAi`'s `buildDebugPrompt`/`onDebug` into
`SQLEditor.utils.ts`.
- Extracts `buildCompletionRequestBody` (the AI completion endpoint's
request body builder) and `planDiffRequestApplication` (the
pending-diff-request application decision: replace vs. open a diff,
depending on whether the editor is currently empty) out of
`useSqlEditorAi` into `SQLEditor.utils.ts`. The `drainDiffRequest`
effect now just applies the plan instead of branching inline.
- Extracts `resolveDiffKeyAction` out of `useSqlEditorShortcuts`'s
window-keydown Enter/Escape branch into `SQLEditor.utils.ts`.

## Test plan
- [x] `pnpm --filter studio typecheck`
- [x] `pnpm test:studio -- SQLEditor` (265 tests passing)
- [x] `pnpm --filter studio run lint:ratchet`

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