feat(sharing): add email and message sharing functionality

app/components/float-menu.tsx

@@ -1,6 +1,7 @@
 "use client"
 
 import { useTranslations } from "next-intl"
+import { usePathname } from "next/navigation"
 import { Github } from "lucide-react"
 import { Button } from "@/components/ui/button"
 import {
@@ -12,9 +13,15 @@ import {
 
 export function FloatMenu() {
   const t = useTranslations("common")
+  const pathname = usePathname()
+  
+  // 在分享页面隐藏GitHub悬浮框
+  if (pathname.includes("/shared/")) {
+    return null
+  }
   
   return (
-    <div className="fixed bottom-6 right-6">
+    <div className="fixed bottom-6 right-6 z-50">
       <TooltipProvider>
         <Tooltip>
           <TooltipTrigger asChild>