feat: 增强桌面启动失败提示与测试覆盖

backend/cmd/desktop/dialog_darwin.go

@@ -4,17 +4,35 @@ package main
 
 import (
 	"fmt"
-	"os/exec"
 	"strings"
-
-	"go.uber.org/zap"
 )
 
-func showError(title, message string) {
-	script := fmt.Sprintf(`display dialog "%s" buttons {"OK"} default button "OK" with title "%s"`,
-		escapeAppleScript(message), escapeAppleScript(title))
-	if err := exec.Command("osascript", "-e", script).Run(); err != nil {
-		dialogLogger().Warn("显示错误对话框失败", zap.Error(err))
+func platformStartupChannels(runner commandRunner) []promptChannel {
+	return []promptChannel{
+		{
+			name: "macos-notification",
+			available: func() error {
+				_, err := runner.LookPath("osascript")
+				return err
+			},
+			run: func(req promptRequest) error {
+				script := fmt.Sprintf(`display notification "%s" with title "%s" subtitle "%s"`,
+					escapeAppleScript(req.message), escapeAppleScript(req.title), escapeAppleScript(req.subtitle))
+				return runner.Run(promptCommandTimeout, nil, "osascript", "-e", script)
+			},
+		},
+		{
+			name: "macos-alert",
+			available: func() error {
+				_, err := runner.LookPath("osascript")
+				return err
+			},
+			run: func(req promptRequest) error {
+				script := fmt.Sprintf(`display alert "%s" message "%s" as critical buttons {"OK"} default button "OK"`,
+					escapeAppleScript(req.title), escapeAppleScript(req.message))
+				return runner.Run(promptCommandTimeout, nil, "osascript", "-e", script)
+			},
+		},
 	}
 }