feat: mount SseProvider, remove polling from layouts

client/src/app/providers/AppProviders.tsx

@@ -3,6 +3,7 @@ import CssBaseline from '@mui/material/CssBaseline'
 import { ThemeProvider, createTheme } from '@mui/material/styles'
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
 import { ThemeControllerProvider, useThemeController } from '@/app/providers/theme-controller'
+import { SseProvider } from './SseProvider'
 
 function AppThemeInner({ children }: PropsWithChildren) {
   const controller = useThemeController()
@@ -185,6 +186,7 @@ export function AppProviders({ children }: PropsWithChildren) {
 
   return (
     <QueryClientProvider client={queryClient}>
+      <SseProvider />
       <ThemeControllerProvider>
         <AppThemeInner>{children}</AppThemeInner>
       </ThemeControllerProvider>

client/src/pages/admin-layout/ui/AdminLayoutPage.tsx

@@ -49,8 +49,6 @@ export function AdminLayoutPage() {
     queryKey: ['admin', 'orders', 'summary'],
     queryFn: fetchAdminOrdersSummary,
     enabled: isAdmin,
-    refetchInterval: 45_000,
-    refetchOnWindowFocus: true,
   })
 
   const newOrdersAttention = ordersSummaryQuery.data?.attentionCount ?? 0

client/src/pages/me/ui/MeLayoutPage.tsx

@@ -47,8 +47,6 @@ export function MeLayoutPage() {
     queryKey: ['me', 'messages', 'unread-count'],
     queryFn: fetchUnreadMessageCount,
     enabled: Boolean(user),
-    refetchInterval: 45_000,
-    refetchOnWindowFocus: true,
   })
 
   const unreadMessages = unreadQuery.data?.count ?? 0