feat(docs): add github stars widget and remove social links

Add a GitHub stars widget component to display repository stars count with caching
Remove social links from config as they're now handled by the new widget
Improve font size and line height clamping with null checks

docs/.vitepress/theme/Layout.vue

@@ -2,6 +2,7 @@
 import DefaultTheme from 'vitepress/theme'
 import { useData } from 'vitepress'
 import TextType from './components/TextType.vue'
+import GitHubStars from './components/GitHubStars.vue'
 import { onMounted, ref, watch } from 'vue'
 import { Setting } from '@element-plus/icons-vue'
 
@@ -29,12 +30,14 @@ const lineHeight = ref(DEFAULT_LINE_HEIGHT)
 const isHydrated = ref(false)
 
 const clampFontSize = (value) => {
+  if (value === null || value === undefined || value === '') return DEFAULT_FONT_SIZE
   const numeric = Number(value)
   if (!Number.isFinite(numeric)) return DEFAULT_FONT_SIZE
   return Math.min(MAX_FONT_SIZE, Math.max(MIN_FONT_SIZE, numeric))
 }
 
 const clampLineHeight = (value) => {
+  if (value === null || value === undefined || value === '') return DEFAULT_LINE_HEIGHT
   const numeric = Number(value)
   if (!Number.isFinite(numeric)) return DEFAULT_LINE_HEIGHT
   return Math.min(MAX_LINE_HEIGHT, Math.max(MIN_LINE_HEIGHT, numeric))
@@ -94,6 +97,7 @@ watch(lineHeight, (next) => {
 <template>
   <DefaultTheme.Layout>
     <template #nav-bar-content-after>
+      <GitHubStars />
       <ClientOnly>
         <el-popover placement="bottom-end" trigger="click" :width="260">
           <template #reference>