feat(app): add error/loading boundaries and update dashboard routes

- Add error.tsx and loading.tsx boundaries for admin, parent, student, teacher routes

- Add dashboard-error-fallback and dashboard-loading-skeleton components

- Add student/learning page, parent/leave routes, teacher textbook components

- Update existing app routes across auth, dashboard, and API endpoints

- Update proxy middleware and next-auth type declarations

src/modules/dashboard/components/teacher-dashboard/teacher-schedule.tsx

@@ -21,14 +21,14 @@ export async function TeacherSchedule({ items }: { items: TeacherTodayScheduleIt
   const t = await getTranslations("dashboard")
   const hasSchedule = items.length > 0
 
-  const getStatus = (start: string, end: string) => {
+  const getStatus = (start: string, end: string): "live" | "upcoming" | "past" => {
     const now = new Date()
     const currentTime = now.getHours() * 60 + now.getMinutes()
 
     const [startH, startM] = start.split(":").map(Number)
     const [endH, endM] = end.split(":").map(Number)
-    const startTime = (startH ?? 0) * 60 + (startM ?? 0)
-    const endTime = (endH ?? 0) * 60 + (endM ?? 0)
+    const startTime = (Number.isFinite(startH) ? startH : 0) * 60 + (Number.isFinite(startM) ? startM : 0)
+    const endTime = (Number.isFinite(endH) ? endH : 0) * 60 + (Number.isFinite(endM) ? endM : 0)
 
     if (currentTime >= startTime && currentTime <= endTime) return "live"
     if (currentTime < startTime) return "upcoming"