Add CSRF token hidden input fields to: - Submission form (submission/form.html) - Login form (auth/login.html) Also fix broken link in login page that referenced submission.form without required product_slug parameter. Changed to link to index page. Bug found during manual testing when submitting feedback resulted in "Bad Request - The CSRF token is missing" error. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>