feat: 添加 vue-sonner，优化反馈

app/stores/answer.ts

@@ -1,5 +1,6 @@
 // app/stores/answer.ts - 答题页和 Dashboard 的统一状态管理
 import { defineStore } from "pinia";
+import { toast } from "vue-sonner";
 
 import type {
   IHealthResponse,
@@ -133,8 +134,10 @@ export const useAnswerStore = defineStore("answer", () => {
       }
 
       searchErrorMessage.value = res.data.msg || "答题失败";
+      toast.error(searchErrorMessage.value);
     } catch (error) {
       searchErrorMessage.value = getClientErrorMessage(error, "服务器内部错误");
+      toast.error(searchErrorMessage.value);
     } finally {
       searchLoading.value = false;
     }
@@ -150,6 +153,7 @@ export const useAnswerStore = defineStore("answer", () => {
         error,
         "健康检查失败"
       );
+      toast.error(dashboardErrorMessage.value);
     }
   };
 
@@ -164,6 +168,7 @@ export const useAnswerStore = defineStore("answer", () => {
         error,
         "统计信息读取失败"
       );
+      toast.error(dashboardErrorMessage.value);
     } finally {
       statsLoading.value = false;
     }
@@ -186,6 +191,7 @@ export const useAnswerStore = defineStore("answer", () => {
         error,
         "问答记录读取失败"
       );
+      toast.error(dashboardErrorMessage.value);
     } finally {
       recordsLoading.value = false;
     }
@@ -204,12 +210,14 @@ export const useAnswerStore = defineStore("answer", () => {
 
     try {
       await AnswerService.clearCache();
+      toast.success("缓存已清空");
       await Promise.allSettled([getStats(), getRecords(1)]);
     } catch (error) {
       dashboardErrorMessage.value = getClientErrorMessage(
         error,
         "缓存清理失败"
       );
+      toast.error(dashboardErrorMessage.value);
     } finally {
       cacheClearing.value = false;
     }