增加小程序，修改游戏前端

games/minipro/calculation/miniprogram/pages/calculator/calculator.wxss

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+/* pages/calculator/calculator.wxss */
+page {
+  height: 100%;
+  background-color: #f5f5f5;
+}
+
+.calculator {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+}
+
+.screen {
+  flex: 1;
+  background-color: #333;
+  color: white;
+  display: flex;
+  flex-direction: column;
+  justify-content: flex-end;
+  align-items: flex-end;
+  padding: 20rpx;
+  word-break: break-all;
+}
+
+.history {
+  font-size: 40rpx;
+  color: #aaa;
+  margin-bottom: 10rpx;
+}
+
+.result {
+  font-size: 80rpx;
+  font-weight: bold;
+}
+
+.keypad {
+  background-color: #fff;
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  grid-gap: 1px;
+  background-color: #ccc; /* Gap color */
+}
+
+.btn {
+  background-color: #fff;
+  height: 150rpx;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  font-size: 40rpx;
+  active-color: #eee;
+}
+
+.btn:active {
+  background-color: #eee;
+}
+
+.operator {
+  color: #ff9500;
+  font-weight: bold;
+}
+
+.equal {
+  background-color: #ff9500;
+  color: white;
+}
+
+.equal:active {
+  background-color: #e08900;
+}
+
+.zero {
+  grid-column: span 2;
+}