[dashaaaa21]

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[Copilot]

Pull request overview

This PR adds backend validation to prevent students from creating duplicate appointments for the same date/time, and includes small frontend layout/style adjustments to stabilize UI presentation.

Changes:

• Added a new validation error message and business validation step for duplicate appointments (HTTP 409).
• Introduced an AppointmentQuery.findExistingAppointment query helper to detect existing active appointments.
• Simplified auth form styling and constrained review card heights to avoid overflow.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
server/src/validation/appointment/appointmentValidation.constants.ts	Adds a new duplicate-appointment validation error message constant.
server/src/validation/appointment/appointmentBusinessValidation.ts	Adds duplicate appointment validation and wires it into appointment creation validation flow.
server/src/repositories/queryRepositories/appointment.query.ts	Adds a query method to find an existing appointment by student/date/time.
client/src/styles/auth.css	Removes animated border styling from the auth form.
client/src/components/homeSection/Reviews/ReviewCardHome.tsx	Sets a fixed card height and hides overflow to keep review cards uniform.

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