fix: resolve user avatar template error

templates/components/header.gohtml

@@ -41,10 +41,10 @@
       <ui-dropdown class="relative block">
         <div data-trigger class="cursor-pointer">
           <button class="flex items-center gap-1 rounded-full p-1 transition-colors hover:bg-surface-hover focus:outline-none">
-            {{if .User}}
+            {{with .User}}
               <img
-                src="{{.User.AvatarURL}}"
-                alt="{{.User.Username}}"
+                src="{{.AvatarURL}}"
+                alt="{{.Username}}"
                 class="h-8 w-8 rounded-full object-cover"
               />
             {{else}}
@@ -58,7 +58,7 @@
 
         <div data-content class="hidden absolute z-50 min-w-[320px] bg-background-button rounded-none shadow-2xl right-0 top-full mt-2">
           <div class="flex flex-col py-1">
-            {{if .User}}
+            {{with .User}}
               <a href="/logout" class="flex w-full items-center px-5 py-3.5 transition-colors focus:outline-none hover:bg-red-500/10 focus:bg-red-500/10">
                 <div class="flex w-full items-center justify-between text-left">
                   <span class="font-medium text-[15px] text-red-500">Log out</span>