Refactor Dashboard and App components to utilize new UI elements

- Updated App.jsx to enhance the SidebarInset and main content layout with improved styling.
- Refactored Dashboard.jsx to replace traditional HTML elements with Card, CardContent, Button, and Badge components for a more consistent UI.
- Improved error handling display and button interactions for better user experience.

Made-with: Cursor

frontend/src/App.jsx

@@ -211,8 +211,8 @@ function MainLayout() {
           </div>
         </SidebarFooter>
       </Sidebar>
-      <SidebarInset>
-        <header className="sticky top-0 z-10 flex h-14 items-center gap-2 border-b bg-background px-4">
+      <SidebarInset className="bg-muted/20">
+        <header className="sticky top-0 z-10 flex h-14 items-center gap-2 border-b bg-background/95 px-4 backdrop-blur">
           <SidebarTrigger />
           <Separator orientation="vertical" className="h-4" />
           <Breadcrumb>
@@ -237,7 +237,7 @@ function MainLayout() {
             </DropdownMenu>
           </div>
         </header>
-        <main id="main-content" className="p-4">
+        <main id="main-content" className="mx-auto w-full max-w-[1600px] p-4">
           <AppRoutes />
         </main>
         <footer className="border-t p-3 text-sm text-muted-foreground">Версия UI: {import.meta?.env?.VITE_APP_VERSION || 'dev'}</footer>

frontend/src/Dashboard.jsx

@@ -32,11 +32,14 @@ import LastSaved from './components/LastSaved.jsx';
 import Tooltip from './components/Tooltip.jsx';
 import Sparkline from './components/Sparkline.jsx';
 import { useAlerts } from './contexts/AlertsContext.jsx';
+import { Card, CardContent } from '@/components/ui/card';
+import { Button } from '@/components/ui/button';
+import { Badge } from '@/components/ui/badge';
 
 function StatCard({ icon: _Icon, color, value, title, subtitle, to, trend, previousValue }) {
   return (
-    <div className="card h-100 position-relative card-hover">
-      <div className="card-body d-flex align-items-center">
+    <Card className="h-100 position-relative card-hover">
+      <CardContent className="d-flex align-items-center p-3">
         <span className={`avatar avatar-lg me-3 bg-${color}-lt text-${color} border-0`}>
           <_Icon size={32} />
         </span>
@@ -56,18 +59,18 @@ function StatCard({ icon: _Icon, color, value, title, subtitle, to, trend, previ
             <div className="text-muted small opacity-75">{subtitle}</div>
           )}
         </div>
-      </div>
+      </CardContent>
       {to && (
         <Link to={to} className="stretched-link" aria-label={`Перейти к ${title}`}></Link>
       )}
-    </div>
+    </Card>
   );
 }
 
 function MetricCard({ title, value, icon: _Icon, color, description }) {
   return (
-    <div className="card h-100 position-relative">
-      <div className="card-body d-flex align-items-center">
+    <Card className="h-100 position-relative">
+      <CardContent className="d-flex align-items-center p-3">
         <span className={`avatar avatar-lg me-3 bg-${color}-lt text-${color} border-0`}>
           <_Icon size={32} />
         </span>
@@ -79,8 +82,8 @@ function MetricCard({ title, value, icon: _Icon, color, description }) {
             <div className="text-muted lh-1">{description}</div>
           )}
         </div>
-      </div>
-    </div>
+      </CardContent>
+    </Card>
   );
 }
 
@@ -357,10 +360,12 @@ function Dashboard() {
 
   if (error) {
     return (
-      <div className="alert alert-danger" role="alert">
-        <IconAlertTriangle className="me-2" />
-        {error}
-      </div>
+      <Card className="border-destructive">
+        <CardContent className="p-3 text-destructive">
+          <IconAlertTriangle className="me-2" />
+          {error}
+        </CardContent>
+      </Card>
     );
   }
 
@@ -377,9 +382,9 @@ function Dashboard() {
               <LastSaved timestamp={lastFetchTime} variant="compact" />
             )}
             <Tooltip content="Обновить данные" shortcut="⌘R">
-              <button className="btn btn-outline-primary btn-sm" onClick={() => window.location.reload()}>
+              <Button variant="outline" size="sm" onClick={() => window.location.reload()}>
                 <IconRefresh className="me-2" /> Обновить
-              </button>
+              </Button>
             </Tooltip>
           </div>
         )}
@@ -389,15 +394,16 @@ function Dashboard() {
       <div className="d-flex flex-column flex-sm-row align-items-start align-items-sm-center justify-content-between gap-2 mb-2">
         <h3 className="mb-0">Пинг сервисов</h3>
         <Tooltip content="Принудительно обновить пинг (без учёта кэша), история и тренд накапливаются">
-          <button
+          <Button
             type="button"
-            className="btn btn-outline-primary btn-sm w-100 w-sm-auto"
+            variant="outline"
+            size="sm"
             onClick={() => fetchPingServices(true)}
             disabled={pingLoading}
           >
             <IconRefresh className={pingLoading ? 'spin me-1' : 'me-1'} size={16} />
             Обновить пинг
-          </button>
+          </Button>
         </Tooltip>
       </div>
       <div className="row g-3 mb-4">
@@ -429,28 +435,29 @@ function Dashboard() {
             <IconBell size={24} />
             Активные оповещения
             {alerts.length > 0 && (
-              <span className="badge bg-danger rounded-pill">{alerts.length}</span>
+              <Badge variant="destructive">{alerts.length}</Badge>
             )}
           </h3>
-          <button
+          <Button
             type="button"
-            className="btn btn-outline-primary btn-sm"
+            variant="outline"
+            size="sm"
             onClick={() => refreshAlerts()}
             disabled={alertsLoading}
           >
             <IconRefresh className={alertsLoading ? 'spin me-1' : 'me-1'} size={16} />
             Обновить
-          </button>
+          </Button>
         </div>
         {alerts.length === 0 && !alertsLoading && (
-          <div className="card">
-            <div className="card-body text-center text-muted py-4">
+          <Card>
+            <CardContent className="text-center text-muted py-4">
               Нет активных оповещений
-            </div>
-          </div>
+            </CardContent>
+          </Card>
         )}
         {alerts.length > 0 && (
-          <div className="card">
+          <Card>
             <div className="list-group list-group-flush">
               {alerts.map((alert) => {
                 const Icon = ALERT_ICONS[alert.type] || IconAlertTriangle;
@@ -471,7 +478,7 @@ function Dashboard() {
                 );
               })}
             </div>
-          </div>
+          </Card>
         )}
       </div>