fix: 修复 Array[Card] 类型不匹配错误

- selected_cards 声明为 Array[Card] 而不是 Array
- handle_human_play 参数类型改为 Array[Card]
- 解决 HandEvaluator.evaluate 参数类型不匹配问题

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src/game/game_controller.gd

@@ -26,7 +26,7 @@ func start_game(config: RuleConfig, human_idx: int = 0, seed_: int = -1) -> void
 	game_state._round.active_player_idx = 0
 	state_changed.emit()
 
-func handle_human_play(cards: Array) -> Dictionary:
+func handle_human_play(cards: Array[Card]) -> Dictionary:
 	if _is_processing:
 		return {"ok": false, "error_code": 1, "data": null}
 	var hand := game_state.get_hand(game_state._round.active_player_idx)

src/ui/components/hand_area.gd

@@ -7,7 +7,7 @@ signal play_requested()
 signal pass_requested()
 
 var card_nodes: Array[CardNode] = []
-var selected_cards: Array = []
+var selected_cards: Array[Card] = []
 const CARD_SCENE := preload("res://src/ui/components/card_node.tscn")
 
 var training_controller: TrainingController = null