Wire KeepRunningInTray to runtime so tray, close, and autostart follow the saved setting.

Autostart entries pass --start-in-tray only when the tray is enabled; Settings warns that the notification icon needs a restart (Fyne limitation).

Co-authored-by: Cursor <cursoragent@cursor.com>

src/ui/tray_test.go

@@ -0,0 +1,14 @@
+package ui
+
+import "testing"
+
+func TestResolveStartHiddenUsesDomainHelper(t *testing.T) {
+	// resolveStartHidden is the UI alias used at startup; it must stay aligned
+	// with domain.ResolveStartHidden so run.go and tests share one definition.
+	if got := resolveStartHidden(true, false); got {
+		t.Fatal("expected hidden start to require both CLI flag and keepInTray")
+	}
+	if !resolveStartHidden(true, true) {
+		t.Fatal("expected hidden start when both flags are set")
+	}
+}