Contact Form Submission + Email Integration

[calebyhan]

Motivation

The Contact Your Senator page has a message form that needs to actually submit to the backend.

Deliverables

• Update the contact form in /senators/contact/page.tsx to call POST /api/contact
• Form fields: name (required), email (required, validated), message (required, textarea), senator (optional dropdown)
• Show success message after submission: "Your message has been sent!"
• Show error message on failure
• Add client-side validation: email format, message not empty, message max length (1000 chars)
• Disable submit button while sending (prevent double-submit)

Important Notes

• Depends on Homepage — Contact CTA + Contact Your Senator Page #102 (contact page UI), Contact Form Email Endpoint #114 (contact endpoint)
• The senator dropdown should list all active senators with their district
• If the backend returns an error, show a generic "Something went wrong" message with a suggestion to email speaker@unc.edu directly