fix: Memory.vue stats fallback and error handling

web/frontend/src/views/Memory.vue

@@ -208,11 +208,11 @@ async function loadData() {
       confidenceStats.low = res.data.stats.low || 0
       confidenceStats.total = res.data.stats.total || 0
     } else {
-      // Fallback: compute from current page items
-      confidenceStats.high = items.value.filter(i => i.confidence > 50).length
-      confidenceStats.medium = items.value.filter(i => i.confidence >= 10 && i.confidence <= 50).length
-      confidenceStats.low = items.value.filter(i => i.confidence < 10).length
-      confidenceStats.total = total.value
+      // Fallback: stats not available from server, default to 0
+      confidenceStats.high = 0
+      confidenceStats.medium = 0
+      confidenceStats.low = 0
+      confidenceStats.total = 0
     }
   } catch (err: any) {
     ElMessage.error('加载失败')
@@ -288,7 +288,9 @@ async function deleteItem(row: any) {
     await api.delete(`/memory/${row.barcode}`)
     ElMessage.success('已删除')
     loadData()
-  } catch {}
+  } catch (err: any) {
+    if (err !== 'cancel') ElMessage.error('删除失败')
+  }
 }
 
 async function reimport() {