feat: UI animation enhancements across all major pages

P1 - Critical UX feedback:
- Add scale-in + slide-up-in entrance animations to profile popover and notification panel
- Port SmoothedProgressBar to EcommercePage (4 generation tools: clone, detail, tryOn, productSet)
- Add result-reveal stagger animation to ecommerce result grids
- Add heart-pop spring animation to CommunityPage favorite toggle

P2 - Visual polish:
- Add scroll-entrance IntersectionObserver animations for HomePage feature sections and experience section
- Add chat-message-in entrance animation to WorkbenchPage message rows
- Fix prefers-reduced-motion accessibility in WelcomeSplash canvas (skip animation, instant entry)

P3 - CSS consolidation:
- Remove conflicting .page-motion definition from legacy-pages.css (keep translateY version from legacy-components.css)
- Consolidate skeleton-shimmer: remove opacity-pulse keyframe from primitives.css, unify with gradient sweep
- Wire up --ease-spring token for heart-pop animation
- Add :active press states (scale 0.97) to topbar buttons, brand lockup

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/features/ecommerce/EcommercePage.tsx

@@ -11,6 +11,7 @@ import {
   SkinOutlined,
 } from "@ant-design/icons";
 import { useEffect, useRef, useState, type CSSProperties, type ChangeEvent, type DragEvent, type ReactNode } from "react";
+import { EcommerceProgressBar } from "./EcommerceProgressBar";
 
 const OSS_MUBAN = "https://stringtest.oss-cn-hangzhou.aliyuncs.com/muban";
 const ecommerceGenerated = `${OSS_MUBAN}/ecommerce-carousel-generated.png`;
@@ -2402,6 +2403,7 @@ function ProductClonePage(_props: ProductClonePageProps = {}) {
       </div>
 
       <footer className="product-clone-panel__footer">
+        {detailStatus === "generating" ? <EcommerceProgressBar status="generating" label="A+详情页" /> : null}
         <button type="button" className="product-clone-primary" disabled={!canGenerateDetail} onClick={handleDetailGenerate}>
           {detailStatus === "generating" ? <LoadingOutlined /> : null}
           {detailPrimaryLabel}
@@ -2547,6 +2549,7 @@ function ProductClonePage(_props: ProductClonePageProps = {}) {
       </div>
 
       <footer className="product-clone-panel__footer">
+        {tryOnStatus === "generating" ? <EcommerceProgressBar status="generating" label="服饰穿戴图" /> : null}
         <button type="button" className="product-clone-primary" disabled={!canGenerateTryOn} onClick={handleTryOnGenerate}>
           {tryOnStatus === "generating" ? <LoadingOutlined /> : null}
           {tryOnPrimaryLabel}
@@ -2592,7 +2595,7 @@ function ProductClonePage(_props: ProductClonePageProps = {}) {
             <span>{productSetPreviewCards[0].label}</span>
           </button>
           <div className="product-set-flow-arrow" aria-hidden="true" />
-          <div className="product-set-card-grid">
+          <div className="product-set-card-grid result-reveal">
             {productSetPreviewCards.slice(1).map((card) => (
               <button key={card.id} type="button" onClick={() => openProductSetPreview(card)}>
                 <img src={card.src} alt={card.label} />
@@ -2605,6 +2608,7 @@ function ProductClonePage(_props: ProductClonePageProps = {}) {
         <section className="product-set-empty-preview" aria-live="polite">
           {productSetStatus === "generating" ? <LoadingOutlined /> : <FileImageOutlined />}
           <strong>{productSetStatus === "generating" ? "正在生成" : "等待生成"}</strong>
+          {productSetStatus === "generating" ? <EcommerceProgressBar status="generating" label="商品套图" /> : null}
           <span>{productSetStatus === "generating" ? "AI 正在整理主图、场景、细节与卖点图。" : "上传商品原图并填写信息后，AI 将为您生成专业的电商商品图"}</span>
         </section>
       )}
@@ -2650,7 +2654,7 @@ function ProductClonePage(_props: ProductClonePageProps = {}) {
             <span>原图素材</span>
           </button>
           <div className="clone-ai-flow-arrow" aria-hidden="true" />
-          <div className="clone-ai-result-grid">
+          <div className="clone-ai-result-grid result-reveal">
             {clonePreviewCards.map((card) => (
               <button key={card.id} type="button" onClick={() => openProductSetPreview(card)}>
                 <img src={card.src} alt={card.label} />
@@ -2663,6 +2667,7 @@ function ProductClonePage(_props: ProductClonePageProps = {}) {
         <section className="clone-ai-empty-state" aria-live="polite">
           {status === "generating" ? <LoadingOutlined /> : <FileImageOutlined />}
           <strong>{status === "generating" ? "正在生成" : "等待生成"}</strong>
+          {status === "generating" ? <EcommerceProgressBar status="generating" label={`${selectedCloneOutput.label}生成`} /> : null}
           <span>
             {status === "generating"
               ? `AI 正在为 ${platform} / ${market} 整理${selectedCloneOutput.label}。`

src/features/ecommerce/EcommerceProgressBar.tsx

@@ -0,0 +1,30 @@
+import { useSmoothedProgress } from "../../hooks/useSmoothedProgress";
+
+interface EcommerceProgressBarProps {
+  status: "idle" | "generating" | "done" | "failed" | string;
+  label?: string;
+}
+
+function mapStatus(status: string): "running" | "completed" | "failed" {
+  if (status === "done") return "completed";
+  if (status === "failed") return "failed";
+  if (status === "generating" || status === "modeling") return "running";
+  return "running";
+}
+
+export function EcommerceProgressBar({ status, label }: EcommerceProgressBarProps) {
+  const progress = mapStatus(status) === "running" ? 50 : 100;
+  const smoothed = useSmoothedProgress(progress, mapStatus(status));
+
+  if (status === "idle") return null;
+
+  return (
+    <div className="ecommerce-progress-bar">
+      <span className="ecommerce-progress-bar__label">{label || "AI 正在生成"}</span>
+      <div className="ecommerce-progress-bar__track">
+        <div className="ecommerce-progress-bar__fill" style={{ width: `${smoothed}%` }} />
+      </div>
+      <span className="ecommerce-progress-bar__value">{smoothed}%</span>
+    </div>
+  );
+}