Build demand intake form

User story

As a policy or portfolio lead, I need a GOV.UK-style form to submit support requests so Central Ops can assess and track them consistently.

Description

Implement a browser-based intake form that posts to the DemandRequest model, with conditional questioning for funding and headcount.

Acceptance criteria

• Form uses GOV.UK / DfE design patterns and styles
• Form captures all mandatory DemandRequest fields required at submission
• Conditional questions are shown when:
  • "Does this request have confirmed funding?" = Yes
  • "Does this request require additional headcount?" = Yes
• On successful submit:
  • A DemandRequest record is created
  • Status is set to "New"
  • The requestor receives a confirmation message on screen
  • The requestor receives a confirmation email (if notifications are in scope)
• Server-side validation implemented for required fields and basic formatting
• Form can pre-populate user name, email and team from auth context (where available)
• Validation errors and summaries are clear and appear in an accessible way

Non-functional

• Form meets WCAG 2.2 AA
• Only authenticated users can submit a request
• Form submission uses secure POST over HTTPS
• Error states are logged for diagnostics (without leaking sensitive data)