fix(cfc-frontend): 成长页六宫格三列布局容差修复 — calc(33.333%-8rpx)→calc(33.333%-12rpx)，余量 0→1.73% 防临界折行（并入自 fix/growth-grid-6col@a6ba414da）

cfc-frontend/pages/growth-main/index.vue

@@ -683,7 +683,7 @@ $c-danger-ink:       $status-danger-deep;
   gap: 12rpx;
 }
 .progress-tile {
-  width: calc(33.333% - 8rpx);
+  width: calc(33.333% - 12rpx);
   box-sizing: border-box;
   display: flex;
   flex-direction: column;