Add warning banner for non-functional file upload UI

[Copilot]

Addresses feedback from PR #836: the file upload form field collected user input despite file upload functionality not being implemented.

Changes

• Added warning banner above file upload section stating feature is non-functional and directing users to GitHub/Live URL fields
• Disabled file upload UI with 50% opacity, pointer-events: none, and disabled attribute
• Updated submit validation to require only GitHub URL or Live URL (removed file upload check)

The file upload section remains visible to indicate planned functionality while preventing user confusion.

{/* Warning Banner */}
<div className="tw-mb-3 tw-rounded-md tw-bg-yellow-50 tw-border tw-border-yellow-200 tw-px-4 tw-py-3">
    <div className="tw-flex">
        <div className="tw-flex-shrink-0">
            <i className="fas fa-exclamation-triangle tw-text-yellow-600" />
        </div>
        <div className="tw-ml-3">
            <p className="tw-text-sm tw-text-yellow-800">
                <strong>File uploads are not yet functional.</strong> Please use the GitHub Repository URL or Live Demo URL fields above to submit your work.
            </p>
        </div>
    </div>
</div>

<div className="tw-relative tw-opacity-50 tw-pointer-events-none">
    <input type="file" disabled ... />
    ...
</div>

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Project	Deployment	Preview	Comments	Updated (UTC)
vets-who-code-app	Error			Dec 5, 2025 4:58am

[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

[!WARNING]

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• checkpoint.prisma.io
  • Triggering command: /usr/local/bin/node /usr/local/bin/node /home/REDACTED/work/vets-who-code-app/vets-who-code-app/node_modules/prisma/build/child {"product":"prisma","version":"6.10.1","cli_install_type":"local","information":"","local_timestamp":"2025-12-05T04:53:42Z","project_hash":"4713398e","cli_path":"/home/REDACTED/work/vets-who-code-app/vets-who-code-app/node_modules/.bin/prisma","cli_path_has (dns block)
  • Triggering command: /usr/local/bin/node /usr/local/bin/node /home/REDACTED/work/vets-who-code-app/vets-who-code-app/node_modules/prisma/build/child {"product":"prisma","version":"6.10.1","cli_install_type":"local","information":"","local_timestamp":"2025-12-05T04:53:44Z","project_hash":"4713398e","cli_path":"/home/REDACTED/work/vets-who-code-app/vets-who-code-app/node_modules/.bin/prisma","cli_path_has (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)