feat(polaris): 实现静态分类页

新增七个预生成分类路由、工具卡片网格与空状态。启用侧栏分类导航和当前分类选中态，修复 Windows 静态导出 RSC 路径并补充产物验证，保持静态导出与安全外链约束。

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

ts/web/nextjs/polaris/src/features/navigation/components/sidebar.tsx

@@ -17,6 +17,7 @@ type SidebarProps = {
   categories: Category[]
   siteName: string
   collapsed: boolean
+  activeCategoryId?: string
   onToggle: () => void
 }
 
@@ -24,10 +25,12 @@ export function Sidebar({
   categories,
   siteName,
   collapsed,
+  activeCategoryId,
   onToggle,
 }: SidebarProps) {
   const ToggleIcon = collapsed ? PanelLeftOpen : PanelLeftClose
   const toggleLabel = collapsed ? "展开侧边栏" : "折叠侧边栏"
+  const homeIsActive = activeCategoryId === undefined
 
   return (
     <TooltipProvider>
@@ -62,9 +65,12 @@ export function Sidebar({
 
         <nav className="sidebar__nav" aria-label="站点导航">
           <Link
-            className="sidebar__nav-item sidebar__nav-item--active"
+            className={cn(
+              "sidebar__nav-item",
+              homeIsActive && "sidebar__nav-item--active",
+            )}
             href="/"
-            aria-current="page"
+            aria-current={homeIsActive ? "page" : undefined}
           >
             <Home aria-hidden="true" />
             <span className={cn("sidebar__label", collapsed && "sr-only")}>
@@ -73,30 +79,32 @@ export function Sidebar({
           </Link>
 
           <div className="sidebar__categories">
-            {/* 本次只验收首页；分类页完成前保持可见但禁用，避免用户进入 404。 */}
-            {categories.map((category) => (
-              <Tooltip key={category.id}>
-                <TooltipTrigger asChild>
-                  <Button
-                    type="button"
-                    variant="ghost"
-                    className="sidebar__nav-item"
-                    aria-disabled="true"
-                    aria-label={`${category.title}，分类页将在下一阶段提供`}
-                  >
-                    <CategoryIcon name={category.icon} />
-                    <span
-                      className={cn("sidebar__label", collapsed && "sr-only")}
+            {categories.map((category) => {
+              const isActive = category.id === activeCategoryId
+
+              return (
+                <Tooltip key={category.id}>
+                  <TooltipTrigger asChild>
+                    <Link
+                      className={cn(
+                        "sidebar__nav-item",
+                        isActive && "sidebar__nav-item--active",
+                      )}
+                      href={`/categories/${category.id}`}
+                      aria-current={isActive ? "page" : undefined}
                     >
-                      {category.title}
-                    </span>
-                  </Button>
-                </TooltipTrigger>
-                <TooltipContent side="right">
-                  分类页将在下一阶段提供
-                </TooltipContent>
-              </Tooltip>
-            ))}
+                      <CategoryIcon name={category.icon} />
+                      <span
+                        className={cn("sidebar__label", collapsed && "sr-only")}
+                      >
+                        {category.title}
+                      </span>
+                    </Link>
+                  </TooltipTrigger>
+                  <TooltipContent side="right">{category.title}</TooltipContent>
+                </Tooltip>
+              )
+            })}
           </div>
         </nav>
       </aside>