feat(初始选择面板): 添加武器选择功能并优化界面布局

- 在初始选择面板中增加武器选择功能
- 添加开始游戏按钮
- 优化界面布局，将标题和选择项分组显示
- 实现选择后自动关闭对应选择区域的功能

scripts/Contents/Panels/SelectIntialFeed.gd

@@ -2,15 +2,39 @@
 extends FullscreenPanelBase
 
 @onready var initialFeedSelection: HBoxContainer = $%initialFeedSelection
+@onready var initialWeaponSelection: HBoxContainer = $%initialWeaponSelection
+@onready var startBtn: Button = $%startBtn
+@onready var title1: Label = $%title1
+@onready var title2: Label = $%title2
+
+func _ready():
+	startBtn.pressed.connect(func(): UIState.closeCurrentPanel())
 
 func beforeOpen(_args: Array = []):
-	for feed in initialFeedSelection.get_children():
-		feed.queue_free()
+	clearFeeds()
+	clearWeapons()
 	ComponentManager.feeds.shuffle()
 	for feed in ComponentManager.feeds:
 		var card = feed.instantiate() as Feed
-		if card.topic == FeedName.Topic.WEAPON:
-			continue
 		card.freeToBuy = true
-		card.selected.connect(func(_success): UIState.closeCurrentPanel())
-		initialFeedSelection.add_child(card)
+		if card.topic == FeedName.Topic.WEAPON:
+			initialWeaponSelection.add_child(card)
+			card.selected.connect(
+				func(_x):
+					clearWeapons()
+					title2.hide()
+			)
+		else:
+			initialFeedSelection.add_child(card)
+			card.selected.connect(
+				func(_x):
+					clearFeeds()
+					title1.hide()
+			)
+
+func clearFeeds():
+	for feed in initialFeedSelection.get_children():
+		feed.queue_free()
+func clearWeapons():
+	for weapon in initialWeaponSelection.get_children():
+		weapon.queue_free()