Marcel Raddatz bd9e1334e0 feat(auth): add server-side validation to signup form action
Validates displayName, email, password server-side before calling
the backend API. Handles null from formData.get() safely.
Returns structured field errors via fail(400, { errors }).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-04-02 15:02:33 +02:00
2026-04-02 14:45:11 +02:00
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