refactor(UI): 优化字段显示逻辑并添加平滑相机移动

将字段显示和隐藏逻辑提取为独立方法
为相机添加位置平滑效果
在游戏重启时重置初始饲料选择状态

scripts/Contents/Panels/Starter.gd

@@ -89,7 +89,10 @@ func startSingleplayerGame():
 	), OutGameStorage.upgradableFieldsValue)
 	UIState.player = EntityBase.generatePlayer(playerNameInput.text, selectedCharacter, extras)
 	WorldManager.rootNode.spawnWave(Vector2.ZERO)
-	UIState.setPanel("CompilingTip")
+	if buildingShader:
+		UIState.setPanel("CompilingTip")
+	else:
+		UIState.setPanel("SelectInitialFeed")
 
 func _ready():
 	historyStack = Composables.useHistoryStack(playerNameInput)