chore: update Radix UI dependencies and add mobile hook

- Updated @radix-ui/react-dialog from ^1.1.2 to ^1.1.15
- Updated @radix-ui/react-separator from ^1.1.0 to ^1.1.8
- Updated @radix-ui/react-slot from ^1.1.0 to ^1.2.4
- Updated @radix-ui/react-tooltip from ^1.1.4 to ^1.2.8
- Added a new hook `useIsMobile` to determine if the viewport is mobile-sized
- Refactored tailwind.config.ts for better readability and maintainability

src/hooks/use-mobile.tsx

@@ -0,0 +1,19 @@
+import * as React from "react"
+
+const MOBILE_BREAKPOINT = 768
+
+export function useIsMobile() {
+  const [isMobile, setIsMobile] = React.useState<boolean | undefined>(undefined)
+
+  React.useEffect(() => {
+    const mql = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`)
+    const onChange = () => {
+      setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
+    }
+    mql.addEventListener("change", onChange)
+    setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
+    return () => mql.removeEventListener("change", onChange)
+  }, [])
+
+  return !!isMobile
+}