feat(ui): refactor components and enhance UX

Updated various UI components to improve user experience and maintainability. Key changes include:
- Refactored `PageHeader` to remove icon handling, simplifying its structure.
- Replaced `KpiMetricsGrid` with `SectionCards` for better layout consistency.
- Enhanced `AppShell` and navigation components to utilize a grouped navigation structure, improving accessibility and organization.
- Introduced new properties in `crud-list-page` for handling empty states and loading indicators.
- Updated styles and classes for better visual consistency across components.

These changes streamline the UI and enhance the overall user experience across the application.

AGENTS.md

@@ -39,9 +39,14 @@ pnpm --filter @evobgp/web lint
 
 После правок `apps/web/**` — **обязательно** `check` и `lint` (WEB-19).
 
-## UX-эталон
+## UX-эталон (vps-tracker, без ReUI)
 
-vps-tracker: `PageShell`, `SectionCards`, `QueryState`, `DataTableCard`, sidebar-07 layout. ReUI не используется — Data Table на shadcn-svelte.
+- **Shell:** `layout/app-shell.svelte` — sidebar-07, `collapsible="icon"`, 5 nav-групп (`nav.ts`), `AppBrand`, `ThemeMenu` в top header, breadcrumb с parent
+- **Страница:** `PageShell` → `PageHeader` (без icon) → `QueryState` / контент
+- **Метрики:** `SectionCards` (не KpiMetricsGrid)
+- **Таблицы:** `DataTableCard` + `AppDataTable` (не голый `Card` + `Table`)
+- **Tabs:** line-variant через `LINE_TAB_TRIGGER_CLASS` (`$lib/ui/app/tabs.ts`)
+- **Тема:** `packages/ui/src/styles/globals.css` синхронизирован с vps-tracker (semantic tokens)
 
 ## Коммиты