feat: implement main game scene with dynamic manager initialization and arena background support

scenes/main.gd

@@ -1115,6 +1115,12 @@ func _create_tekton(pos: Vector2i, tekton_id: int, is_static: bool = false):
 func _precalculate_static_positions():
 	"""Calculate and reserve Static Tekton positions early."""
 	if not multiplayer.is_server(): return
+
+	# Static Tekton stands only exist in Free Mode
+	if LobbyManager.game_mode == "Stop n Go":
+		reserved_static_positions = []
+		return
+
 	var enhanced_gridmap = $EnhancedGridMap
 	if not enhanced_gridmap: return
 	
@@ -2241,8 +2247,7 @@ func _show_game_over_panel():
 	
 	var rematch_label = Label.new()
 	rematch_label.name = "RematchVoteLabel"
-	var required_votes = max(1, ceili(LobbyManager.players_in_room.size() / 2.0))
-	rematch_label.text = "0/%d" % required_votes
+	rematch_label.text = "0/2"
 	rematch_label.add_theme_font_size_override("font_size", 24)
 	rematch_label.add_theme_color_override("font_color", Color(0.7, 0.7, 0.7))
 	rematch_container.add_child(rematch_label)