feat: wire gui instance start and delete confirmation

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)
+	}
+}