refactor(hero): 优化英雄描述文本展示逻辑与UI布局

1.  重构英雄组件富文本生成逻辑，直接使用配置表手写文案替代动态生成
2.  更新英雄配置表中的技能描述文本，优化表述更贴合实际效果
3.  调整任务面板和英雄预制体的UI位置与尺寸，适配新的展示内容
4.  移除冗余的空引用属性，新增刷新石数量显示节点

assets/resources/gui/element/mission.prefab

@@ -6064,7 +6064,7 @@
     "value": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": -71.13500000000002,
+      "y": -81.21500000000002,
       "z": 0
     }
   },
@@ -6517,7 +6517,7 @@
     "value": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": -71.13500000000002,
+      "y": -81.21500000000002,
       "z": 0
     }
   },
@@ -6970,7 +6970,7 @@
     "value": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": -71.13500000000002,
+      "y": -81.21500000000002,
       "z": 0
     }
   },
@@ -16119,7 +16119,6 @@
     "__prefab": {
       "__id__": 1006
     },
-    "showCards": null,
     "cardPanNode": {
       "__id__": 447
     },
@@ -16145,7 +16144,6 @@
     "herosBoxNode": {
       "__id__": 325
     },
-    "heroPrefab": null,
     "showEquips": {
       "__id__": 786
     },
@@ -16203,6 +16201,9 @@
     "hero_num_node": {
       "__id__": 243
     },
+    "refresh_stone_num_node": {
+      "__id__": 207
+    },
     "_id": ""
   },
   {