fix: add error handling to Barcodes, Tasks, Logs, Sync views

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/frontend/src/views/Barcodes.vue

@@ -183,7 +183,7 @@
 <script setup lang="ts">
 import { ref, reactive, computed, onMounted, onUnmounted } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
-import { Search, Refresh, Plus, Connection, Right, Setting } from '@element-plus/icons-vue'
+import { Search, Refresh, Connection, Right, Setting } from '@element-plus/icons-vue'
 import api from '../api'
 import { useDebounce } from '../composables/useDebounce'
 
@@ -337,7 +337,9 @@ async function deleteItem(row: any) {
     await api.delete(`/barcodes/${row.barcode}`)
     ElMessage.success('已删除')
     loadData()
-  } catch {}
+  } catch (err: any) {
+    if (err !== 'cancel') ElMessage.error('删除失败')
+  }
 }
 
 onMounted(loadData)