fix(settings): проверять доступность текущего источника без гонок

app/(main)/settings/page.tsx

@@ -92,7 +92,7 @@ function DatabaseRestoreConfirm({
 
 export default function SettingsPage() {
   const [section,  setSection]  = useState<NavSection>("Общие")
-  const { mode, setMode, backendUrl, backendUrlLocked, mockModeAvailable, backendStatus, checkBackend } = useDataSource()
+  const { mode, setMode, backendUrl, backendUrlLocked, mockModeAvailable, backendStatus, backendChecking, checkBackend } = useDataSource()
   const { theme, setTheme } = useTheme()
   const [dbBackupBusy, setDbBackupBusy] = useState(false)
   const [dbRestoreBusy, setDbRestoreBusy] = useState(false)
@@ -197,7 +197,7 @@ export default function SettingsPage() {
               {backendStatus === undefined && (
                 <span className="flex items-center gap-1.5 text-xs text-muted-foreground">
                   <span className="size-2 rounded-full bg-muted-foreground/40 inline-block" />
-                  Не проверялось
+                  {backendChecking ? "Проверка…" : "Не проверялось"}
                 </span>
               )}
               {backendStatus === true && (