fix: platform-aware delete confirmation + trial CTA to purchase

Delete subscription:
- Telegram mini app: native destructive popup (red button)
- Web (mobile + desktop): Sheet bottom panel with full-width buttons
- Both: proper loading state on delete button

Trial CTA: leads to /subscription/purchase (trial cannot be renewed)

src/pages/Subscription.tsx

@@ -5,13 +5,15 @@ import { useNavigate, useParams } from 'react-router';
 import { subscriptionApi } from '../api/subscription';
 import { WebBackButton } from '../components/WebBackButton';
 import {
-  Dialog,
-  DialogContent,
-  DialogDescription,
-  DialogFooter,
-  DialogHeader,
-  DialogTitle,
-} from '../components/primitives/Dialog';
+  Sheet,
+  SheetContent,
+  SheetDescription,
+  SheetFooter,
+  SheetHeader,
+  SheetTitle,
+} from '../components/primitives/Sheet';
+import { useDestructiveConfirm } from '../platform/hooks/useNativeDialog';
+import { usePlatform } from '../platform';
 import TrafficProgressBar from '../components/dashboard/TrafficProgressBar';
 import { HoverBorderGradient } from '../components/ui/hover-border-gradient';
 import { useTrafficZone } from '../hooks/useTrafficZone';
@@ -183,8 +185,10 @@ export default function Subscription() {
   const g = getGlassColors(isDark);
   const haptic = useHaptic();
   const [copied, setCopied] = useState(false);
-  const [showDeleteConfirm, setShowDeleteConfirm] = useState(false);
+  const [showDeleteSheet, setShowDeleteSheet] = useState(false);
   const [deleteLoading, setDeleteLoading] = useState(false);
+  const { platform } = usePlatform();
+  const destructiveConfirm = useDestructiveConfirm();
 
   // Helper to format price from kopeks
   const formatPrice = (kopeks: number) => `${formatAmount(kopeks / 100)} ${currencySymbol}`;
@@ -1278,8 +1282,33 @@ export default function Subscription() {
       {isMultiTariff && subscription && !subscription.is_active && !subscription.is_trial && (
         <>
           <button
-            onClick={() => setShowDeleteConfirm(true)}
-            className="flex w-full items-center justify-center gap-2 rounded-2xl border border-red-400/20 bg-red-400/5 p-3.5 text-sm font-medium text-red-400 transition-colors hover:bg-red-400/10"
+            onClick={async () => {
+              if (platform === 'telegram') {
+                // Telegram: native destructive popup
+                const confirmed = await destructiveConfirm(
+                  t(
+                    'subscription.deleteWarning',
+                    'Подписка будет удалена безвозвратно. Все данные, устройства и настройки будут потеряны.',
+                  ),
+                  t('subscription.confirmDelete', 'Да, удалить'),
+                  t('subscription.deleteTitle', 'Удалить подписку?'),
+                );
+                if (!confirmed) return;
+                setDeleteLoading(true);
+                try {
+                  await subscriptionApi.deleteSubscription(subscription.id);
+                  queryClient.invalidateQueries({ queryKey: ['subscriptions-list'] });
+                  navigate('/subscriptions', { replace: true });
+                } catch {
+                  setDeleteLoading(false);
+                }
+              } else {
+                // Web: show Sheet
+                setShowDeleteSheet(true);
+              }
+            }}
+            disabled={deleteLoading}
+            className="flex w-full items-center justify-center gap-2 rounded-2xl border border-red-400/20 bg-red-400/5 p-3.5 text-sm font-medium text-red-400 transition-colors hover:bg-red-400/10 disabled:opacity-50"
           >
             <svg
               className="h-4 w-4"
@@ -1294,27 +1323,24 @@ export default function Subscription() {
                 d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
               />
             </svg>
-            {t('subscription.delete', 'Удалить подписку')}
+            {deleteLoading
+              ? t('common.processing', 'Удаление...')
+              : t('subscription.delete', 'Удалить подписку')}
           </button>
 
-          <Dialog open={showDeleteConfirm} onOpenChange={setShowDeleteConfirm}>
-            <DialogContent className="max-w-sm">
-              <DialogHeader>
-                <DialogTitle>{t('subscription.deleteTitle', 'Удалить подписку?')}</DialogTitle>
-                <DialogDescription>
+          {/* Web: Sheet confirmation */}
+          <Sheet open={showDeleteSheet} onOpenChange={setShowDeleteSheet}>
+            <SheetContent>
+              <SheetHeader>
+                <SheetTitle>{t('subscription.deleteTitle', 'Удалить подписку?')}</SheetTitle>
+                <SheetDescription>
                   {t(
                     'subscription.deleteWarning',
                     'Подписка будет удалена безвозвратно. Все данные, устройства и настройки будут потеряны. Это действие нельзя отменить.',
                   )}
-                </DialogDescription>
-              </DialogHeader>
-              <DialogFooter className="gap-2 sm:gap-0">
-                <button
-                  onClick={() => setShowDeleteConfirm(false)}
-                  className="rounded-xl border border-dark-700 bg-dark-800 px-4 py-2.5 text-sm font-medium text-dark-300 transition-colors hover:bg-dark-700"
-                >
-                  {t('common.cancel', 'Отмена')}
-                </button>
+                </SheetDescription>
+              </SheetHeader>
+              <SheetFooter>
                 <button
                   onClick={async () => {
                     setDeleteLoading(true);
@@ -1324,19 +1350,25 @@ export default function Subscription() {
                       navigate('/subscriptions', { replace: true });
                     } catch {
                       setDeleteLoading(false);
-                      setShowDeleteConfirm(false);
+                      setShowDeleteSheet(false);
                     }
                   }}
                   disabled={deleteLoading}
-                  className="rounded-xl bg-red-500 px-4 py-2.5 text-sm font-medium text-white transition-colors hover:bg-red-600 disabled:opacity-50"
+                  className="w-full rounded-xl bg-red-500 py-3 text-sm font-semibold text-white transition-colors hover:bg-red-600 disabled:opacity-50"
                 >
                   {deleteLoading
                     ? t('common.processing', 'Удаление...')
                     : t('subscription.confirmDelete', 'Да, удалить')}
                 </button>
-              </DialogFooter>
-            </DialogContent>
-          </Dialog>
+                <button
+                  onClick={() => setShowDeleteSheet(false)}
+                  className="w-full rounded-xl border border-dark-700 bg-dark-800 py-3 text-sm font-medium text-dark-300 transition-colors hover:bg-dark-700"
+                >
+                  {t('common.cancel', 'Отмена')}
+                </button>
+              </SheetFooter>
+            </SheetContent>
+          </Sheet>
         </>
       )}