Add delayed email scheduling with random timing and idempotency keys

[hiroshinishio]

• Create generateRandomDelay utility for 30-60 minute random delays
• Update sendEmail function to use proper Resend types (CreateEmailOptions, CreateEmailRequestOptions)
• Add idempotency key generation using randomUUID for email deduplication
• Configure welcome emails to use random delay via scheduledAt parameter
• Contact emails send immediately without delay
• Convert Date to ISO string format for Resend API compatibility

🤖 Generated with Claude Code

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• modified app/actions/resend/send-email.ts (Line: 0%, Function: 0%, Branch: 0%)
• modified app/api/auth/[...nextauth]/route.ts (Line: 0%, Function: 0%, Branch: 0%)
• added utils/generate-random-delay.ts

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