Update login/register modal

[kevinmulier]

https://www.figma.com/design/qmG3BxYcVvg8icA0aWrfv8/Integrated-App-Experience?node-id=3669-193331&t=SW9Jeq0IwSM5zrPV-4

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Label/Input field update : https://www.figma.com/design/qMgAYjMd16jTLwrLP5iLj2/%F0%9F%9F%A7-Design-System-%7C-Block-Found?node-id=1140-69641&t=yYnoSIp0KdwjhJlK-4

[kevinmulier]

Includes updating Modal and Forms across the whole website

[kevinmulier]

Modals to test :

• [ ] Tip modal → on teacher card
• [ ] Authentication modal (register, login, reset password)
• [ ] b-cert “organize an exam”
• [ ] Timestamping modal in course exam results (on course exam chapter)
• [ ] Try again modal in course exam results (on course exam chapter)
• [ ] Time alert in course exam
• [ ] Exam submit in course exam
• [ ] Cancel a class booking (in course)
• [ ] Delete career profile
• [ ] Change display name
• [ ] Change email
• [ ] Change password
• [ ] Change picture
• [ ] Remove teacher in admin role allocation
• [ ] Delete discount code (admin AND teacher dashboard)
• [ ] Generate codes (admin AND teacher dashboard)
• [ ] Create announcement
• [ ] Delete announcement
• [ ] Publish grades for assignment
• [ ] Student confirm assignment order preferences
• [ ] Student confirm submission of assignment
• [ ] Summer school withdrawal

@mumacadam @carmine-pb