style: 优化MissionCardComp代码格式与细节

调整变量类型声明的空格、代码缩进与空行规范，修复部分UI更新逻辑，修正卡牌位置数组的空格格式，统一代码书写风格

assets/script/game/map/MissionCardComp.ts

@@ -765,16 +765,13 @@ export class MissionCardComp extends CCComp {
         if (this.pool_lv_node) {
             this.pool_lv_node.active = true;
             const lv = Math.max(CARD_POOL_INIT_LEVEL, Math.min(CARD_POOL_MAX_LEVEL, Math.floor(this.poolLv)));
-            const poolLvStr = `lv${lv}`;
-            this.pool_lv_node.children.forEach(child => {
-                if (child.name === "light") {
-                    child.active = false;
-                } else if (child.name === "bg") {
-                    child.active = true;
-                } else {
-                    child.active = (child.name === poolLvStr);
+            const lvNode = this.pool_lv_node.getChildByName("lv");
+            if (lvNode) {
+                const label = lvNode.getComponent(Label);
+                if (label) {
+                    label.string = `lv.${lv}`;
+                }
             }
-            });
             const widget = this.pool_lv_node.getComponent(Widget);
             if (widget) widget.updateAlignment();
             this.pool_lv_node.children.forEach(child => {