feat: student mode support for thanks page (admin-auth only)

- add hidden student_mode field in add.php form
- pass mode=student through redirect to thanks.php in formulaire.php
- thanks.php renders clean student thank-you page (no header, centered button)
- add CSS for .thanks-student-page, .btn-new-form, .thanks-success, .thanks-error
- admin auth always required; student mode is purely UI variant on the physical machine
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Pontoporeia committed 2026-04-15 14:24:44 +02:00
1 parent c3affd2285
commit f4aba500e6
7 files changed
+254 -81

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