refactor: update dashboard quick links and app shell for improved layout and functionality

Refactored the DashboardQuickLinks component to simplify icon classes for better semantic clarity. Updated the AppShell component to integrate the AppSwitcher and AppsMenu, enhancing navigation and user experience. Adjusted the layout of the app shell header and main content for improved consistency and alignment. Updated UI design documentation to reflect these changes and ensure adherence to shared design standards.

docs/ui-design-contract.md

@@ -48,9 +48,28 @@ Ops / list / dashboard / detail / settings — только **Frame**, не shad
 
 Gating: KV `ui_show_quick_actions` in `global_settings` via `PATCH /v1/settings` (default `true`).
 
+## Shared App Shell chrome
+
+Эталон: CFDM + ReUI [app-shell-12](https://reui.io/preview/base/app-shell-12) · monitor/switchers [app-shell-7](https://reui.io/preview/base/app-shell-7).
+
+При переключении между vps-tracker / CFDM / EvoBGP меняются **только** sidebar nav и `main` content. ClassNames chrome идентичны.
+
+| Токен / зона | Значение |
+|--------------|----------|
+| `--sidebar-width` | `240px` |
+| Sidebar accent | primary **14%** mix + transparent border |
+| Header | `h-12`, `sticky`, `border-b`, `px-4 md:px-6` (без blur / без `h-16`) |
+| Header right | **AppsMenu** → **SystemMonitorPopover** → **ModeToggle** |
+| `main` | `gap-4 md:gap-6`, `px-4 py-4 md:px-6 md:py-5` |
+| Sidebar header | `AppSwitcher` (не static brand) |
+
+App Switcher ids: `vps-tracker` · `cfdm` · `evobgp`. Override: `VITE_APP_SWITCHER` JSON.
+
+QuickActionGrid icons: только semantic **text** (`text-info` / `text-primary` / …) на kit `bg-muted` — без solid `bg-primary` fills. Preview: [stats-12](https://reui.io/preview/base/stats-12).
+
 ## System monitor
 
-`SystemMonitorPopover` in app-shell header next to `ModeToggle`. Preview: https://reui.io/preview/base/app-shell-12 · https://reui.io/preview/base/app-shell-7
+`SystemMonitorPopover` in app-shell header next to `ModeToggle` (после AppsMenu). Preview: https://reui.io/preview/base/app-shell-12 · https://reui.io/preview/base/app-shell-7
 
 ## MCP workflow
 
@@ -64,7 +83,7 @@ Primitives: MCP `plugin-shadcn-shadcn` + `@evobgp/ui`.
 
 ## Spacing
 
-- Main: `gap-4 md:gap-6`, `px-4 md:px-6`
+- AppShell main: `gap-4 md:gap-6`, `px-4 py-4 md:px-6 md:py-5` (shared chrome)
 - No `space-y-*` / `space-x-*` — use `flex` + `gap-*`
 - Max 1 primary CTA per screen
 - Semantic tokens only (`variant="success"|"info"|"warning"`) — no raw `bg-emerald-*`