修改：点云效果优化

src/views/douyin/generating.vue

@@ -28,12 +28,7 @@
                   @handoff="onHandoff"
                 />
               </div>
-              <img
-                v-if="resultUrl"
-                class="stage-layer result-layer"
-                :src="resultUrl"
-                alt=""
-              >
+              <!-- 效果图点云阶段不叠底图，等揭示后再进预览页展示 -->
             </div>
           </div>
           <div v-if="errorTip" class="error-tip">{{ errorTip }}</div>
@@ -154,12 +149,13 @@ const ordering = ref(false)
 const errorTip = ref('')
 const showConfirmModal = ref(false)
 
-/** 红框正方形边长：首屏即算好，不依赖 CSS min() */
+/** 红框正方形边长：按 app-shell 实际宽度算，避免桌面端用整窗宽导致偏大/错位 */
 function calcStageSide() {
   if (typeof window === 'undefined') return 280
-  const w = window.innerWidth || 375
+  const shell = document.querySelector('.app-shell') as HTMLElement | null
+  const w = shell?.clientWidth || Math.min(window.innerWidth || 375, 540)
   const h = window.innerHeight || 667
-  // 约屏宽 72%、屏高 40%，上限 320，贴近预览卡片区域
+  // 约容器宽 72%、屏高 40%，上限 320，贴近预览卡片区域
   return Math.max(180, Math.round(Math.min(w * 0.72, h * 0.4, 320)))
 }
 
@@ -297,24 +293,13 @@ function onHandoff() {
 }
 
 function startSoftProgress() {
+  // 固定节奏：每 300ms +1%，效果图就绪后冲到 96%，预览前再动画到 100%
   softTimer = setInterval(() => {
     if (showResult.value) return
-    // 效果图已到：快速冲到 96%，留给揭示动画收尾到 100%
-    if (resultUrl.value) {
-      if (progress.value < 96) {
-        progress.value = Math.min(96, progress.value + 3.2)
-      }
-      return
-    }
-    const cap = config.poll.softCap
+    const cap = resultUrl.value ? 96 : config.poll.softCap
     if (progress.value >= cap) return
-    // 整体加快：前段更快，后段仍有余量
-    let step = 2.4
-    if (progress.value >= 35) step = 1.4
-    if (progress.value >= 60) step = 0.85
-    if (progress.value >= 75) step = 0.45
-    progress.value = Math.min(cap, progress.value + step)
-  }, 280)
+    progress.value = Math.min(cap, progress.value + 1)
+  }, 300)
 }
 
 function startMaskFetch() {
@@ -516,7 +501,7 @@ onUnmounted(() => {
   flex-direction: column;
   align-items: center;
   width: max-content;
-  max-width: calc(100vw - 32px);
+  max-width: calc(100% - 32px);
 }
 
 .stage-shell {
@@ -545,14 +530,6 @@ onUnmounted(() => {
   height: 100% !important;
 }
 
-.result-layer {
-  object-fit: contain;
-  opacity: 0.35;
-  z-index: 2;
-  pointer-events: none;
-  background: transparent;
-}
-
 .error-tip {
   margin-top: 12px;
   max-width: 280px;