refactor(界面): 移除物品购买逻辑并调整卡片组件

- 删除MissionCardComp中与物品购买相关的代码逻辑
- 调整card.prefab的宽度和精灵图集引用
- 简化卡片选择逻辑，统一处理物品使用事件

assets/resources/gui/uis/bgs/card.prefab

@@ -851,7 +851,7 @@
     },
     "_contentSize": {
       "__type__": "cc.Size",
-      "width": 80,
+      "width": 130,
       "height": 80
     },
     "_anchorPoint": {
@@ -888,7 +888,7 @@
       "a": 255
     },
     "_spriteFrame": {
-      "__uuid__": "deedea09-8f2b-400f-9803-4cfd38e45d1a@eb208",
+      "__uuid__": "deedea09-8f2b-400f-9803-4cfd38e45d1a@c83a0",
       "__expectedType__": "cc.SpriteFrame"
     },
     "_type": 0,
@@ -903,7 +903,10 @@
     "_fillRange": 0,
     "_isTrimmedMode": true,
     "_useGrayscale": false,
-    "_atlas": null,
+    "_atlas": {
+      "__uuid__": "deedea09-8f2b-400f-9803-4cfd38e45d1a",
+      "__expectedType__": "cc.SpriteAtlas"
+    },
     "_id": ""
   },
   {