perf(stargalaxy): replace JS computed sizing with pure CSS classes (.podium-4/5/6)

frontend/pages/square/components/StarGalaxy/PodiumCard.vue

@@ -2,7 +2,6 @@
   <view
     class="podium-card"
     :class="['podium-' + rank]"
-    :style="[cardStyle, internalPosition]"
     @click="handleClick"
   >
     <!-- 相框（最底层） -->
@@ -32,26 +31,6 @@ const props = defineProps({
 
 const emit = defineEmits(["cardClick"]);
 
-// 颁奖台 3 个位置的尺寸和位置（与 ScatteredRanks 的 rpx 单位对齐）
-const PODIUM_SIZES = {
-  4: { width: 240, height: 260 }, // TOP 1
-  5: { width: 200, height: 200 }, // TOP 2
-  6: { width: 192, height: 192 }, // TOP 3
-};
-const PODIUM_POSITIONS = {
-  4: {
-    position: "absolute",
-    top: "400rpx",
-    left: "50%",
-    transform: "translateX(-50%)",
-  },
-  5: { position: "absolute", top: "120rpx", left: "60rpx" },
-  6: { position: "absolute", top: "150rpx", right: "60rpx" },
-};
-
-const internalSize = computed(() => PODIUM_SIZES[props.rank]);
-const internalPosition = computed(() => PODIUM_POSITIONS[props.rank]);
-
 // 内部 rank 4/5/6 对外显示 1/2/3（颁奖台：TOP 1/2/3）
 const displayRank = computed(() => props.rank - 3);
 
@@ -74,11 +53,6 @@ const labelSizes = {
   6: { w: 78, h: 18, font: 11 },
 };
 
-const cardStyle = computed(() => ({
-  width: internalSize.value.width + "rpx",
-  height: internalSize.value.height + "rpx",
-}));
-
 const labelStyle = {
   width: labelSizes[props.rank].w + "rpx",
   height: labelSizes[props.rank].h + "rpx",
@@ -93,12 +67,37 @@ function handleClick() {
 
 <style scoped>
 .podium-card {
-  position: relative;
+  position: absolute;
   display: flex;
   align-items: center;
   justify-content: center;
 }
 
+/* TOP 1: 中央大卡（最大） */
+.podium-4 {
+  top: 400rpx;
+  left: 50%;
+  transform: translateX(-50%);
+  width: 240rpx;
+  height: 260rpx;
+}
+
+/* TOP 2: 左上 */
+.podium-5 {
+  top: 120rpx;
+  left: 60rpx;
+  width: 200rpx;
+  height: 200rpx;
+}
+
+/* TOP 3: 右上 */
+.podium-6 {
+  top: 150rpx;
+  right: 60rpx;
+  width: 192rpx;
+  height: 192rpx;
+}
+
 .podium-frame {
   position: absolute;
   inset: 0;