feat: enhance ecommerce UI with typewriter animation, icon buttons, responsive layout, and refined design tokens

- EcommercePage.tsx: Add typewriter animation (useTypewriter hook) for slogan text with blinking cursor; replace text-based add/delete buttons with Ant Design icons (CloudUploadOutlined, DeleteOutlined); make command history panel responsive to window width (auto-collapse ≤1180px); update button labels from generic "添加" to context-specific "上传商品图" / "上传素材"
- New useTypewriter.ts hook: Character-by-character typewriter animation with configurable speed and pause-before-loop, auto-resets on text change
- reset.css: Add comprehensive HTML/body typography baseline (font-size, text-rendering, font-smoothing, line-height); extend reset coverage to select/canvas/svg elements; add overflow-wrap:anywhere for text-bearing elements; add min-width:0 to prevent form element overflow
- primitives.css: Add reusable typography utility classes (ui-page-title, ui-section-title, ui-body-copy) with design token references
- tokens.css: Expand design token set for typography scales, font weights, and leading values
- ecommerce-standalone.css: Add 689 lines of standalone ecommerce page styles
- Page CSS (ecommerce, image-workbench, more-tools, more, script-tokens, script-tokens-v5, studio-layout): Enhanced visual styles and layout refinements across all pages
- app-shell.css: Shell-level layout and styling improvements

src/styles/components/primitives.css

@@ -15,6 +15,115 @@
   outline-offset: 2px;
 }
 
+.ui-page-title {
+  margin: 0;
+  color: var(--fg-body);
+  font-size: var(--text-title);
+  font-weight: var(--weight-heavy);
+  line-height: var(--leading-heading);
+}
+
+.ui-section-title {
+  margin: 0;
+  color: var(--fg-body);
+  font-size: var(--text-xl);
+  font-weight: var(--weight-bold);
+  line-height: var(--leading-heading);
+}
+
+.ui-body-copy {
+  color: var(--fg-muted);
+  font-size: var(--text-base);
+  font-weight: var(--weight-regular);
+  line-height: var(--leading-body);
+}
+
+.ui-label {
+  color: var(--fg-muted);
+  font-size: var(--text-sm);
+  font-weight: var(--weight-semibold);
+  line-height: var(--leading-control);
+}
+
+:where(.ui-surface, .ui-card, .ui-panel) {
+  min-width: 0;
+}
+
+:where(.ui-card-grid, .responsive-card-grid) {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(var(--card-min), 1fr));
+  gap: var(--space-6);
+  min-width: 0;
+}
+
+:where(.ui-form-grid, .responsive-form-grid) {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: var(--space-6);
+  min-width: 0;
+}
+
+:where(.ui-form-grid, .responsive-form-grid) > * {
+  min-width: 0;
+}
+
+:where(.ui-toolbar, .responsive-toolbar) {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  min-width: 0;
+  gap: var(--space-3);
+}
+
+:where(.ui-button, .responsive-button) {
+  min-width: 0;
+  min-height: var(--form-control-min-height);
+  font-family: var(--font-sans);
+  font-size: var(--text-base);
+  font-weight: var(--weight-bold);
+  line-height: var(--leading-control);
+}
+
+:where(.ui-media-frame, .responsive-media-frame) {
+  display: grid;
+  place-items: center;
+  min-width: 0;
+  overflow: hidden;
+}
+
+:where(.ui-media-frame, .responsive-media-frame) :where(img, video, canvas) {
+  width: 100%;
+  height: 100%;
+  object-fit: contain;
+}
+
+:where(.ui-truncate) {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+@media (max-width: 767px) {
+  :where(.ui-form-grid, .responsive-form-grid) {
+    grid-template-columns: minmax(0, 1fr);
+  }
+
+  :where(.ui-card-grid, .responsive-card-grid) {
+    gap: var(--space-5);
+  }
+}
+
+@media (max-width: 480px) {
+  :where(.ui-toolbar, .responsive-toolbar) {
+    align-items: stretch;
+  }
+
+  :where(.ui-toolbar, .responsive-toolbar) > :where(button, a, .ui-button, .responsive-button) {
+    flex: 1 1 auto;
+  }
+}
+
 .page-loading-skeleton {
   display: flex;
   flex-direction: column;
@@ -86,9 +195,9 @@
 }
 
 .page-loading-center__text {
-  font: 400 13px/1 'PingFang SC', 'Microsoft YaHei UI', system-ui, sans-serif;
+  font: var(--weight-regular) var(--text-md) / var(--leading-control) var(--font-sans);
   color: var(--text-muted, rgba(255,255,255,.45));
-  letter-spacing: 0.02em;
+  letter-spacing: 0;
 }
 
 .page-loading-spinner {