Email Configuration Enhancements and Auth UI Cleanup

This release strengthens the email sending pipeline with multi-provider support and robust error handling, cleans up authentication form styling, and brings the dependency tree up to date.

Product

• Enhanced email configuration to support multiple providers (Resend and Cloudflare), with environment examples updated accordingly
• Improved email sending logic with reply-to address support and better error handling for delivery failures across contact and newsletter routes
• Removed decorative asterisks from authentication form titles (login, signup, forgot password, reset password, 2FA verify) for a cleaner interface
• Added comprehensive unit tests for contact route, newsletter route, and mail sending logic

Code

• Batch-updated 26 dependencies including Next.js 16.2.5, React 19.2.6, fumadocs-mdx 15.0.0, Zod 4.4.3, and Wrangler 4.89.1
• Renamed next.config.ts to next.config.mts for explicit TypeScript module config with Cloudflare and MDX support