implement reactive breakpoints

+ fix breaking queue page when there's no data

src/stores/breakpoints.ts

@@ -0,0 +1,7 @@
+import { useBreakpoints, breakpointsTailwind } from "@vueuse/core";
+
+const breakpoints = useBreakpoints(breakpointsTailwind);
+
+const xl = breakpoints.greater("xl");
+
+export { xl };