feat: implement start dialog rendering for Pyodide compatibility

rats.py

@@ -93,6 +93,20 @@ class MiceMaze(
         self.scrolling = False
         self.sounds = {}
         self.start_game()
+        # If running under Pyodide, try to force a single-frame render of the
+        # start menu so the dialog is visible even before the JS-driven
+        # requestAnimationFrame loop begins. This helps when the browser
+        # scheduling would otherwise miss the initial dialog draw.
+        try:
+            import js
+            try:
+                self.show_start_dialog()
+            except Exception:
+                # Non-fatal if the helper can't run now
+                pass
+        except Exception:
+            # Not running in Pyodide - ignore
+            pass
         self.background_texture = None
         self.configs = self.get_config()
         self.combined_scores = None
@@ -187,7 +201,7 @@ class MiceMaze(
             
             self.render_engine.dialog(greeting_title, 
                                     subtitle=full_subtitle,
-                                    image=self.assets["da"])
+                                    image=self.assets["BMP_WEWIN"])
             return
         self.render_engine.delete_tag("unit")
         self.render_engine.delete_tag("effect")
@@ -221,6 +235,48 @@ class MiceMaze(
         except Exception:
             pass
 
+    def show_start_dialog(self):
+        """Force a single-frame render of the start menu/dialog.
+
+        This calls the underlying render engine's `step` method once with
+        a small update callback that draws the dialog. Useful under Pyodide
+        where the JS-driven animation loop may start slightly later and the
+        initial dialog could be missed.
+        """
+        try:
+            # Reconstruct the greeting and subtitle similar to update_maze
+            if self.profile_integration:
+                player_name = self.profile_integration.get_profile_name()
+                device_id = self.profile_integration.get_device_id()
+            else:
+                player_name = 'Guest'
+                device_id = 'Unknown Device'
+
+            greeting_title = f"Welcome to Mice, {player_name}!"
+
+            if self.profile_integration and self.profile_integration.current_profile:
+                profile = self.profile_integration.current_profile
+                stats_line = f"Best Score: {profile.get('best_score', 0)} | Games: {profile.get('games_played', 0)}"
+                full_subtitle = f"A game by Matteo, because he was bored.\nDevice: {device_id}\n{stats_line}"
+            else:
+                full_subtitle = f"A game by Matteo, because he was bored.\nDevice: {device_id}\nNo profile loaded - playing as guest"
+
+            def do_dialog():
+                try:
+                    self.render_engine.dialog(greeting_title,
+                                              subtitle=full_subtitle,
+                                              image=self.assets.get('BMP_WEWIN'))
+                except Exception:
+                    pass
+
+            if hasattr(self.render_engine, 'step'):
+                # Draw background and then the dialog, flip once
+                self.render_engine.step(update=do_dialog, bg_update=self.draw_maze)
+            else:
+                do_dialog()
+        except Exception as e:
+            print('[DEBUG] show_start_dialog failed:', e)
+
     def run(self):
         self.render_engine.mainloop(update=self.update_maze, bg_update=self.draw_maze)