test(postgrest): verify hints get passed down

[mandarini]

Adds a mock-based contract test that locks in postgrest-js' passthrough of the hint field on PostgrestError. The mock body matches what supautils >= 3.2.0 actually emits end-to-end (verified against a real Supabase project), so the test also serves as living documentation of the supautils 42501 response format.

Three cases covered: { data, error } passthrough, .throwOnError() rejection carrying the same hint, and the hint: null case for when supautils isn't active for the role.

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@supabase/auth-js

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@supabase/functions-js

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@supabase/postgrest-js

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@supabase/realtime-js

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@supabase/storage-js

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@supabase/supabase-js

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commit: 523b2cf

[themavik]

permission-hints.test.ts pins the supautils-shaped 42501 body and proves hint survives both res.error and throwOnError. mockFetch as any is fine for a jest double; you could tighten types later without changing behavior.