继续收口首页可导航扁平行

新增 PlatformNavigableListItem 统一 desktop flat row 的交互骨架
接入首页搜索结果与桌面最近作品最近浏览入口
补充组件测试首页回归测试并更新收口计划和共享决策记录

src/components/common/PlatformNavigableListItem.tsx

@@ -0,0 +1,88 @@
+import type { ComponentPropsWithoutRef, ReactNode } from 'react';
+
+type PlatformNavigableListItemAlign = 'center' | 'start';
+
+type PlatformNavigableListItemProps = Omit<
+  ComponentPropsWithoutRef<'button'>,
+  'children' | 'type'
+> & {
+  children: ReactNode;
+  leading?: ReactNode;
+  trailing?: ReactNode;
+  align?: PlatformNavigableListItemAlign;
+  leadingClassName?: string;
+  trailingClassName?: string;
+  bodyClassName?: string;
+};
+
+const ALIGN_CLASS: Record<PlatformNavigableListItemAlign, string> = {
+  center: 'items-center gap-3',
+  start: 'items-start gap-4',
+};
+
+/**
+ * 轻量可导航列表行骨架。
+ * 只统一 button 语义与 left-content/right-affordance 结构，不持有业务文案、badge 或封面规则。
+ */
+export function PlatformNavigableListItem({
+  children,
+  leading = null,
+  trailing = null,
+  align = 'center',
+  className,
+  leadingClassName,
+  trailingClassName,
+  bodyClassName,
+  ...props
+}: PlatformNavigableListItemProps) {
+  return (
+    <button
+      type="button"
+      className={[
+        'platform-navigable-list-item flex w-full min-w-0 text-left',
+        ALIGN_CLASS[align],
+        className ?? null,
+      ]
+        .filter(Boolean)
+        .join(' ')}
+      {...props}
+    >
+      {leading ? (
+        <div
+          className={[
+            'platform-navigable-list-item__leading shrink-0',
+            leadingClassName ?? null,
+          ]
+            .filter(Boolean)
+            .join(' ')}
+        >
+          {leading}
+        </div>
+      ) : null}
+
+      <div
+        className={[
+          'platform-navigable-list-item__body min-w-0 flex-1',
+          bodyClassName ?? null,
+        ]
+          .filter(Boolean)
+          .join(' ')}
+      >
+        {children}
+      </div>
+
+      {trailing ? (
+        <div
+          className={[
+            'platform-navigable-list-item__trailing shrink-0',
+            trailingClassName ?? null,
+          ]
+            .filter(Boolean)
+            .join(' ')}
+        >
+          {trailing}
+        </div>
+      ) : null}
+    </button>
+  );
+}