feat: week select

app/src/main/java/agzam/vyatsu/domain/model/Schedule.kt

@@ -15,4 +15,7 @@ data class Schedule(
 ) {
     fun periodOf(date: LocalDate): SchedulePeriod? =
         periods.firstOrNull { !date.isBefore(it.weekStart) && !date.isAfter(it.weekEnd) }
+
+    fun daysOf(period: SchedulePeriod): List<Day> =
+        days.filter { !it.date.isBefore(period.weekStart) && !it.date.isAfter(period.weekEnd) }
 }

app/src/main/java/agzam/vyatsu/domain/repository/PreferencesRepository.kt

@@ -4,4 +4,8 @@ interface PreferencesRepository {
     suspend fun selectedGroupId(): String?
     suspend fun setSelectedGroup(groupId: String)
     suspend fun clearSelectedGroup()
+    suspend fun selectedWeekStart(): String?
+    suspend fun setSelectedWeekStart(weekStart: String)
+    suspend fun selectedDayDate(): String?
+    suspend fun setSelectedDayDate(date: String)
 }