fix building errors

src/components/UserDashboard.vue

@@ -304,7 +304,6 @@ import { useAuth } from '@/composables/useAuth'
 import api from '@/services/api'
 import ModernNavbar from '@/components/ModernNavbar.vue'
 
-const router = useRouter()
 const auth = useAuth()
 
 const activePeriod = ref('week')
@@ -360,10 +359,6 @@ function loadNextWorkout() {
   }
 }
 
-function startQuickWorkout() {
-  router.push('/calendar')
-}
-
 function getWorkoutColor(type) {
   const colors = {
     'Cycling': '#667eea',

src/components/WorkoutCalendar.vue

@@ -596,14 +596,6 @@ function isToday(date) {
     date.getFullYear() === today.getFullYear()
 }
 
-function formatDate(dateStr) {
-  return new Date(dateStr).toLocaleDateString('en-US', {
-    month: 'short',
-    day: 'numeric',
-    year: 'numeric',
-  })
-}
-
 function formatDuration(seconds) {
   const hours = Math.floor(seconds / 3600)
   const minutes = Math.floor((seconds % 3600) / 60)