web/frpc: redesign frpc dashboard with sidebar nav, proxy/visitor list and detail views (#5237)

web/frpc/src/composables/useResponsive.ts

@@ -0,0 +1,8 @@
+import { useBreakpoints } from '@vueuse/core'
+
+const breakpoints = useBreakpoints({ mobile: 0, desktop: 768 })
+
+export function useResponsive() {
+  const isMobile = breakpoints.smaller('desktop') // < 768px
+  return { isMobile }
+}