修复favicon未替换问题和优化尺寸调整功能

- 彻底修复favicon未替换问题：改进Metadata配置，添加客户端FaviconUpdater组件
- 添加缓存破坏参数，确保浏览器正确加载新的favicon
- 尺寸调整完成后添加下载按钮
- 保持尺寸编辑状态下左右图片虚线框相同尺寸（714x570px）
- 优化工具栏布局，宽高设置移动到选择比例工具栏后面

app/layout.tsx

@@ -2,6 +2,7 @@ import type { Metadata } from "next";
 import { Geist, Geist_Mono } from "next/font/google";
 import { Toaster } from "sonner";
 import { ThemeProvider } from "@/components/theme-provider";
+import { FaviconUpdater } from "@/components/favicon-updater";
 
 import "./globals.css";
 import { SessionProvider } from "next-auth/react";
@@ -10,6 +11,11 @@ import { getSiteSettings } from "@/lib/db/queries";
 
 export async function generateMetadata(): Promise<Metadata> {
   const settings = await getSiteSettings();
+  
+  // 处理 favicon URL，添加缓存破坏参数确保更新
+  const faviconUrl = settings.favicon 
+    ? `${settings.favicon}${settings.favicon.includes('?') ? '&' : '?'}v=${Date.now()}`
+    : "/favicon.ico";
 
   return {
     title: {
@@ -18,8 +24,12 @@ export async function generateMetadata(): Promise<Metadata> {
     },
     description: settings.siteName,
     icons: {
-      icon: settings.favicon || "/favicon.ico",
-      apple: settings.favicon || "/favicon.ico",
+      icon: [
+        { url: faviconUrl, sizes: "any" },
+        { url: faviconUrl, type: "image/x-icon" },
+      ],
+      apple: faviconUrl,
+      shortcut: faviconUrl,
     },
   };
 }
@@ -145,6 +155,7 @@ export default function RootLayout({
         />
       </head>
       <body className="antialiased">
+        <FaviconUpdater />
         <ThemeProvider
           attribute="class"
           defaultTheme="dark"

components/favicon-updater.tsx

@@ -0,0 +1,47 @@
+"use client";
+
+import { useEffect } from "react";
+
+export function FaviconUpdater() {
+  useEffect(() => {
+    // 从 API 获取最新的 favicon 设置
+    fetch("/api/site-settings")
+      .then((res) => res.json())
+      .then((settings) => {
+        if (settings.favicon) {
+          const faviconUrl = settings.favicon;
+          const timestamp = Date.now();
+          const urlWithCache = `${faviconUrl}${faviconUrl.includes("?") ? "&" : "?"}v=${timestamp}`;
+
+          // 移除所有旧的 favicon link 标签
+          const oldLinks = document.querySelectorAll('link[rel*="icon"]');
+          oldLinks.forEach((link) => link.remove());
+
+          // 添加新的 favicon link 标签
+          const link = document.createElement("link");
+          link.rel = "icon";
+          link.type = "image/x-icon";
+          link.href = urlWithCache;
+          document.head.appendChild(link);
+
+          // 添加 Apple touch icon
+          const appleLink = document.createElement("link");
+          appleLink.rel = "apple-touch-icon";
+          appleLink.href = urlWithCache;
+          document.head.appendChild(appleLink);
+
+          // 添加 shortcut icon
+          const shortcutLink = document.createElement("link");
+          shortcutLink.rel = "shortcut icon";
+          shortcutLink.href = urlWithCache;
+          document.head.appendChild(shortcutLink);
+        }
+      })
+      .catch((error) => {
+        console.error("[Favicon] Error updating favicon:", error);
+      });
+  }, []);
+
+  return null;
+}
+

components/image-annotator.tsx

@@ -1253,7 +1253,7 @@ export function ImageAnnotator({ imageUrl, onConfirm, onCancel }: ImageAnnotator
             /* 尺寸调整模式 - 左右对比布局 */
             <>
               {/* 左侧：原图 */}
-              <div className="flex flex-col border-2 border-dashed border-border rounded-lg bg-muted/20 p-2 overflow-hidden" style={{ height: "570px" }}>
+              <div className="flex flex-col border-2 border-dashed border-border rounded-lg bg-muted/20 p-2 overflow-hidden" style={{ width: "714px", height: "570px" }}>
                 <div className="mb-1 text-xs font-medium text-muted-foreground text-center">原图</div>
                 <div className="flex-1 flex items-center justify-center overflow-auto min-h-0" style={{ height: "calc(570px - 2rem)" }}>
                   {image && (
@@ -1275,7 +1275,21 @@ export function ImageAnnotator({ imageUrl, onConfirm, onCancel }: ImageAnnotator
               
               {/* 右侧：尺寸调整预览画布 */}
               <div className="flex flex-col border-2 border-dashed border-primary/50 rounded-lg bg-muted/30 p-2 overflow-hidden" style={{ width: "714px", height: "570px" }}>
-                <div className="mb-1 text-xs font-medium text-muted-foreground text-center">调整尺寸</div>
+                <div className="mb-1 flex items-center justify-between">
+                  <span className="text-xs font-medium text-muted-foreground">调整尺寸</span>
+                  {(processedImageUrl || processedImageBase64) && processType === "resize" && (
+                    <Button
+                      variant="default"
+                      size="sm"
+                      onClick={handleDownloadProcessed}
+                      className="h-7 px-3 bg-primary text-primary-foreground hover:bg-primary/90 shadow-md flex items-center gap-1.5 font-medium"
+                      title="下载调整后的图片"
+                    >
+                      <Download className="h-3.5 w-3.5" />
+                      <span className="text-xs">下载</span>
+                    </Button>
+                  )}
+                </div>
                 <div 
                   ref={resizeContainerRef}
                   className="flex items-center justify-center overflow-auto"