style(Footer): 修改微信二维码图片样式为object-contain

将微信二维码图片的object-cover改为object-contain以确保图片完整显示，同时为珞珈经纬二维码弹窗添加内边距

Author: chenguanzhou

src/components/Footer.astro

@@ -129,7 +129,7 @@ const friendLinks = [
                 <img
                   src="/assets/social/wechat-cveo.png"
                   alt="CVEO课题组微信公众号二维码"
-                  class="w-32 h-32 object-cover rounded-lg"
+                  class="w-32 h-32 object-contain rounded-lg"
                   loading="lazy"
                 />
               </div>
@@ -166,15 +166,15 @@ const friendLinks = [
               class="absolute bottom-full left-1/2 transform -translate-x-1/2 mb-2 hidden group-hover:block z-10"
             >
               <div
-                class="bg-white rounded-lg shadow-lg border border-slate-200"
+                class="bg-white p-3 rounded-lg shadow-lg border border-slate-200"
               >
                 <p class="text-xs text-slate-600 mb-2 text-center">
                   扫码关注珞珈经纬
                 </p>
                 <img
                   src="/assets/social/wechat-luojiagingwei.png"
                   alt="珞珈经纬微信公众号二维码"
-                  class="w-32 h-32 object-cover rounded-lg"
+                  class="w-32 h-32 object-contain rounded-lg"
                   loading="lazy"
                 />
               </div>