Fix GDScript type inference errors in smoke test

Author: Saffron Worker

scripts/game_state.gd

@@ -110,10 +110,10 @@ func validate_save_schema(data: Dictionary) -> Dictionary:
 					if not tile.has(tile_key):
 						return {"valid": false, "reason": "tile[%d] missing key '%s'" % [i, tile_key]}
 				# Validate tile shape: amount must be numeric, resource must be string
-				var amt := tile.get("amount", -1)
+				var amt: Variant = tile.get("amount", -1)
 				if typeof(amt) != TYPE_INT and typeof(amt) != TYPE_FLOAT:
 					return {"valid": false, "reason": "tile[%d].amount must be numeric" % i}
-				var res := tile.get("resource", "")
+				var res: Variant = tile.get("resource", "")
 				if typeof(res) != TYPE_STRING:
 					return {"valid": false, "reason": "tile[%d].resource must be string" % i}
 				# build_kind is optional; if present must be string

scripts/main.gd

@@ -348,8 +348,8 @@ func _on_startup_new_game() -> void:
 	sync_dock_option(chosen_anchor)
 	save_settings()
 	# Backup current save before destructive reset (issue #178)
-	var _gs := GameState.new()
-	var _bk := _gs.backup_save()
+	var _gs: GameState = GameState.new()
+	var _bk: String = _gs.backup_save()
 	if not _bk.is_empty():
 		push_event_safe("Backup saved before reset: %s" % _bk.get_file())
 	apply_dock_position()