fix(touch): show the joystick and skill buttons only in the game phase

The controls keyed off CPythonBackground's warp map name, which the
loading window sets before the game window exists, so the loading screen
already showed them. Also require CPythonNetworkStream's phase to be
"Game" (PORT_IsGamePhase, exposed as PythonBoot::InGamePhase).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/host/touch_controller.h

@@ -588,7 +588,7 @@ public:
 private:
     bool gameplay_controls_visible() const {
 #ifdef MT_NATIVE_HAS_LIVE_CLIENT
-        return !PythonBoot::CurrentMapName().empty();
+        return PythonBoot::InGamePhase() && !PythonBoot::CurrentMapName().empty();
 #else
         return false;
 #endif