Initializes theme on app load

Ensures the selected theme (dark/light mode) is applied immediately when the application loads, preventing a flash of incorrect theme on startup.

src/App.vue

@@ -9,10 +9,14 @@ import 'vue-sonner/style.css'
 import { useMarketPreloader } from '@/modules/market/composables/useMarketPreloader'
 import { auth } from '@/composables/useAuthService'
 import { toast } from 'vue-sonner'
+import { useTheme } from '@/components/theme-provider'
 
 const route = useRoute()
 const showLoginDialog = ref(false)
 
+// Initialize theme (applies dark mode immediately)
+useTheme()
+
 // Initialize preloader
 const marketPreloader = useMarketPreloader()