Backend for regular students

[dashaaaa21]

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[Copilot]

Pull request overview

This PR adds a "regular students" feature to the backend, allowing teachers to mark appointment participants as regular (recurring) students, update their weekly schedules, and query the list of regular students/teachers. It also improves the calendar UI on the client side with month-navigation controls and fixes a date-selection highlight bug.

Changes:

• New backend endpoints and data model fields (isRegularStudent, weeklySchedule, addedToRegularAt) for managing regular student relationships on appointments
• Calendar component refactored to support month navigation (previous/next) and corrected selected-date highlighting across months
• Removed booked-slot overlay from the teacher's lesson-schedule editor

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
server/src/types/appointment/appointment.types.ts	Adds WeeklyScheduleSlot and UpdateWeeklyScheduleType interfaces
server/src/db/schemes/types/appointment.types.ts	Extends AppointmentTypeDB with new regular-student fields
server/src/db/schemes/appointmentSchema.ts	Adds Mongoose schema fields for isRegularStudent, weeklySchedule, addedToRegularAt
server/src/repositories/commandRepositories/appointment.command.ts	Adds setRegularStudent, removeRegularStudent, updateWeeklySchedule DB operations
server/src/repositories/queryRepositories/appointment.query.ts	Adds getRegularStudentsByTeacher and getRegularTeachersByStudent queries with pagination
server/src/services/appointment/appointment.service.ts	Adds service methods for all new regular-student operations and extends formatAppointmentResponse
server/src/controllers/appointment.controller.ts	Adds five new controller methods for the new endpoints
server/src/routes/appointmentRoute.ts	Registers the five new routes
client/src/pages/privetTeachersPages/teacherProfile/TeacherProfile.tsx	Removes unused booked-slots query and helper
client/src/components/teacherProfileSection/LessonSchedule.tsx	Removes booked-slot UI and related logic
client/src/components/teacherSection/teacherSchedule/Calendar/Calendar.tsx	Adds month navigation and fixes selected-date highlight for non-current months
client/src/components/icons/ChevronLeft.tsx	New chevron-left SVG icon component
client/src/components/icons/ChevronRight.tsx	New chevron-right SVG icon component

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