fix: Switching language error on tabbed pages, add 404 page

src/components/MainHeader.astro

@@ -19,7 +19,7 @@ const marginBottom = {
 ---
 
 <header class="mb-10.625 lg:fixed">
-  <h1 class={`${marginBottom} text-8 c-primary font-bold font-title lg:text-9 w-75%`}>
+  <h1 class={`${marginBottom} text-8 c-primary font-bold font-title lg:text-9 w-75% lg:w-full`}>
     <!-- Fix text cropping issues during view transition on ios by adding a div tag -->
     <div
       class="box-content inline-block pr-1.25"

src/components/Widgets/LanguageSwitcher.astro

@@ -1,6 +1,6 @@
 ---
 import { getNextLangUrl, getPostNextLangUrl } from '@/i18n/path'
-import { isPostPage } from '@/utils/page'
+import { isPostPage, isTagPage } from '@/utils/page'
 
 interface Props {
   supportedLangs: string[]
@@ -9,10 +9,15 @@ interface Props {
 const { supportedLangs } = Astro.props
 const currentPath = Astro.url.pathname
 const isPost = isPostPage(currentPath)
+const isTag = isTagPage(currentPath)
 
-const nextUrl = isPost
-  ? getPostNextLangUrl(currentPath, supportedLangs)
-  : getNextLangUrl(currentPath)
+// 检查是否应使用受限的语言列表
+const useFilteredLangs = isPost || (isTag && supportedLangs.length > 0)
+
+// 根据页面类型选择合适的语言切换方式
+const nextUrl = useFilteredLangs
+  ? getPostNextLangUrl(currentPath, supportedLangs) // 只在有内容的语言间切换
+  : getNextLangUrl(currentPath) // 在所有语言间切换
 ---
 
 <a