parity(auth): resend() with PKCE flow should include code_challenge in request [from supabase-js]

[grdsdev]

SDK Parity: C# implementation needed

Reference Implementation (supabase-js)

• Commit: 658cc0d
• PR: #2144
• Module: auth
• Type: bug-fix / enhancement

What Changed

When auth.Resend() is called to resend a confirmation email and the client uses PKCE flow, the request must include code_challenge and code_challenge_method in the body. Without this, the resent confirmation link cannot be completed in a PKCE flow.

Code Reference

if (this.flowType === 'pkce') {
  [codeChallenge, codeChallengeMethod] = await getCodeChallengeAndMethod(...)
}
// POST /resend body: { email, type, code_challenge, code_challenge_method }

Key Behaviors

• PKCE flow: body must include code_challenge + code_challenge_method
• Non-PKCE: no change

Acceptance Criteria

• Resend() includes code_challenge when using PKCE flow
• Non-PKCE unchanged

Context

• supabase-js version: v2.108.0
• Related Linear issues: SDK-1023 (dart), SDK-1025 (swift)

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