fix(mutations): use extractErrorMessage for complete error display

Provider add/update/delete mutations were using error.message directly,
which doesn't extract Tauri invoke errors properly. Now using the same
extractErrorMessage pattern as the rest of the codebase.

src/lib/query/mutations.ts

@@ -61,10 +61,11 @@ export const useAddProviderMutation = (appId: AppId) => {
       );
     },
     onError: (error: Error) => {
+      const detail = extractErrorMessage(error) || t("common.unknown");
       toast.error(
         t("notifications.addFailed", {
           defaultValue: "添加供应商失败: {{error}}",
-          error: error.message,
+          error: detail,
         }),
       );
     },
@@ -92,10 +93,11 @@ export const useUpdateProviderMutation = (appId: AppId) => {
       );
     },
     onError: (error: Error) => {
+      const detail = extractErrorMessage(error) || t("common.unknown");
       toast.error(
         t("notifications.updateFailed", {
           defaultValue: "更新供应商失败: {{error}}",
-          error: error.message,
+          error: detail,
         }),
       );
     },
@@ -133,10 +135,11 @@ export const useDeleteProviderMutation = (appId: AppId) => {
       );
     },
     onError: (error: Error) => {
+      const detail = extractErrorMessage(error) || t("common.unknown");
       toast.error(
         t("notifications.deleteFailed", {
           defaultValue: "删除供应商失败: {{error}}",
-          error: error.message,
+          error: detail,
         }),
       );
     },