feat: wire gui instance start and delete confirmation

internal/domain/browser.go

@@ -50,15 +50,18 @@ func (s LaunchSpec) Normalize() (LaunchSpec, error) {
 		return LaunchSpec{}, fmt.Errorf("%w: user data dir must be absolute", ErrInvalidLaunchSpec)
 	}
 	target := strings.TrimSpace(s.TargetURL)
-	parsed, err := url.Parse(target)
-	if err != nil || parsed.Host == "" || parsed.User != nil || (parsed.Scheme != "http" && parsed.Scheme != "https") {
-		return LaunchSpec{}, fmt.Errorf("%w: target URL must be absolute http or https", ErrInvalidLaunchSpec)
+	if target != "" {
+		parsed, err := url.Parse(target)
+		if err != nil || parsed.Host == "" || parsed.User != nil || (parsed.Scheme != "http" && parsed.Scheme != "https") {
+			return LaunchSpec{}, fmt.Errorf("%w: target URL must be absolute http or https", ErrInvalidLaunchSpec)
+		}
+		target = parsed.String()
 	}
 	normalized := s
 	normalized.Executable = strings.TrimSpace(s.Executable)
 	normalized.UserDataDir = filepath.Clean(userDataDir)
 	normalized.ProfileDirectory = strings.TrimSpace(s.ProfileDirectory)
-	normalized.TargetURL = parsed.String()
+	normalized.TargetURL = target
 	normalized.ProxyServer = strings.TrimSpace(s.ProxyServer)
 	normalized.ExtraArgs = append([]string(nil), s.ExtraArgs...)
 	return normalized, nil

internal/domain/browser_test.go

@@ -42,3 +42,14 @@ func TestLaunchSpecNormalizeRejectsUnsafeValues(t *testing.T) {
 		}
 	}
 }
+
+func TestLaunchSpecNormalizeAllowsAnEmptyTargetURL(t *testing.T) {
+	profile := filepath.Join(t.TempDir(), "profile")
+	normalized, err := (LaunchSpec{Kind: BrowserChrome, UserDataDir: profile}).Normalize()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if normalized.TargetURL != "" {
+		t.Fatalf("target URL = %q, want empty", normalized.TargetURL)
+	}
+}