fix：修复Sass 模块启用函数警告

frontend/.claude/settings.local.json

@@ -3,7 +3,8 @@
     "allow": [
       "WebFetch(domain:www.figma.com)",
       "Bash(git checkout:*)",
-      "Read(//mnt/d/work/license-manager/backend/internal/models/**)"
+      "Read(//mnt/d/work/license-manager/backend/internal/models/**)",
+      "Bash(npm run build:*)"
     ],
     "deny": [],
     "ask": []

frontend/src/views/Licenses/LicenseSearch.vue

@@ -152,7 +152,8 @@ onMounted(() => {
 </script>
 
 <style scoped lang="scss">
-@import '@/assets/styles/variables.scss';
+@use '@/assets/styles/variables.scss' as *;
+@use 'sass:color';
 
 .license-search-container {
   height: calc(100vh - 80px);
@@ -306,7 +307,7 @@ onMounted(() => {
     background-color: $primary-color;
 
     &:hover {
-      background-color: darken($primary-color, 10%);
+      background-color: color.adjust($primary-color, $lightness: -10%);
     }
   }
 
@@ -315,7 +316,7 @@ onMounted(() => {
     background-color: $primary-color;
 
     &:hover {
-      background-color: darken($primary-color, 10%);
+      background-color: color.adjust($primary-color, $lightness: -10%);
     }
   }
 }

frontend/src/views/Licenses/LicensesView/components/ChangeHistory.vue

@@ -80,7 +80,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, watch, onMounted, computed } from 'vue'
+import { ref, watch, onMounted } from 'vue'
 import { ElMessage } from 'element-plus'
 import type { AuthorizationCode, AuthorizationChangeItem } from '@/api/license'
 import { getAuthorizationChanges } from '@/api/license'

frontend/src/views/Licenses/LicensesView/components/LicenseInfo.vue

@@ -18,7 +18,7 @@
           </div>
           <div class="device-info-row">
             <span class="device-info-item">设备地址：{{ device.last_online_ip || device.activation_ip || '-' }}</span>
-            <span class="device-info-item">最后活跃时间：{{ formatDateTime(device.last_heartbeat) }}</span>
+            <span class="device-info-item">最后活跃时间：{{ formatDateTime(device.last_heartbeat || '') }}</span>
           </div>
         </div>