fix: 调整UI元素布局与合并规则默认值

- 在 MissionCardComp 中调整合并规则的默认值和兜底逻辑，使其与 MissionHeroComp 保持一致
- 调整多个 prefab 中 UI 元素的位置、尺寸、字体样式和激活状态，优化界面布局

assets/script/game/map/MissionCardComp.ts

@@ -269,13 +269,13 @@ export class MissionCardComp extends CCComp {
     }
 
     private getMergeRule(): { needCount: number, maxLv: number } {
-        let needCount = 2;
-        let maxLv = 3;
+        let needCount = 3;
+        let maxLv = 2; // 兜底值改为2，与 MissionHeroComp 保持一致
         ecs.query(ecs.allOf(MissionHeroCompComp)).forEach((entity: ecs.Entity) => {
             const comp = entity.get(MissionHeroCompComp);
             if (!comp) return;
             needCount = comp.merge_need_count === 2 ? 2 : 3;
-            maxLv = Math.max(1, Math.floor(comp.merge_max_lv ?? 3));
+            maxLv = Math.max(1, Math.floor(comp.merge_max_lv ?? 2));
         });
         return { needCount, maxLv };
     }