Update library.vue

pages/library.vue

@@ -22,7 +22,7 @@
                 <div class="flex flex-col flex-grow">
                     <div class="flex items-center text-lg gap-2">
                         <UIcon name="i-heroicons-square-3-stack-3d" />
-                        <div>帖子</div>
+                        <div>主题</div>
                     </div>
                     <div class="flex flex-col gap-4 mt-4">
                         <ILibraryThread />