feat(workbench): 新增收集箱页面 — 素材列表/详情分栏布局 + 新增/选中/删除 mock 交互

src/web/styles.css

@@ -264,3 +264,46 @@ body {
 .x-markdown-dark .x-md-table-wrap {
   overflow-x: auto;
 }
+
+.app-inbox-page {
+  display: flex;
+  height: 100%;
+  overflow: hidden;
+}
+
+.app-inbox-sidebar {
+  display: flex;
+  width: 280px;
+  flex-direction: column;
+  gap: var(--ant-margin-sm);
+  padding: var(--ant-padding-sm);
+  border-right: 1px solid var(--ant-color-border-secondary);
+  background: var(--ant-color-bg-container);
+}
+
+.app-inbox-list {
+  display: flex;
+  flex: 1;
+  flex-direction: column;
+  gap: var(--ant-margin-xs);
+  min-height: 0;
+  overflow-y: auto;
+}
+
+.app-inbox-content {
+  display: flex;
+  flex: 1;
+  flex-direction: column;
+  min-height: 0;
+  min-width: 0;
+  padding: var(--ant-padding-xl);
+  overflow-y: auto;
+}
+
+.app-inbox-card-selected {
+  box-shadow: 0 0 0 1px var(--ant-color-primary);
+}
+
+.app-inbox-datepicker {
+  width: 100%;
+}