feat: outbox model for the following feed

src/lib/common.ts

@@ -5,3 +5,7 @@ export function isTouchDevice() {
 export function isEmail(email: string) {
   return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)
 }
+
+export function isDevEnv() {
+  return process.env.NODE_ENV === 'development'
+}

src/lib/utils.ts

@@ -4,3 +4,10 @@ import { twMerge } from 'tailwind-merge'
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
 }
+
+export function isSafari() {
+  if (typeof window === 'undefined' || !window.navigator) return false
+  const ua = window.navigator.userAgent
+  const vendor = window.navigator.vendor
+  return /Safari/.test(ua) && /Apple Computer/.test(vendor) && !/Chrome/.test(ua)
+}