fix(web): 控制台界面细节与 uhd_web 控件规范对齐

- 顶栏搜索移进右侧玻璃胶囊;输入框改淡玻璃(边线 0.46 → 0.16,悬停加深,聚焦 / 出错保留光晕)
- 新增 SegmentedControl(滑动 seg-thumb),替换站点、下载、订阅、文件、智能体列表及对话框里的实心选中块;Tabs 改为同一枚滑块
- 开关型按钮统一 outline + aria-pressed 选中外观;页头 / 工具栏次操作描边、图标钮描边圆;文件排序改 Select;下载总速度加标签
- 分页一页放得下时只留总数、空列表不渲染、按容器宽度收起按钮
- 运行状态存储区重排;智能体列表页与会话页共用外壳路由,标题与左栏不再重挂载
- 站点卡片「⋯」不再单独换行;设置导航、状态计数、多选条件改玻璃选中态

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

apps/web/app/components/sites/site-add-dialog.tsx

@@ -278,11 +278,7 @@ export function SiteAddDialog({ onClose, initialKind }: { onClose: () => void; i
                   <span
                     className={cn(
                       "grid h-5 w-5 place-items-center rounded-full border text-micro",
-                      step > i
-                        ? "border-foreground bg-foreground text-background"
-                        : step === i
-                          ? "border-foreground"
-                          : "border-border",
+                      step > i ? "pill-selected text-foreground" : step === i ? "border-foreground" : "border-border",
                     )}
                   >
                     {step > i ? <Check className="h-3 w-3" /> : i + 1}