feat: upgrade codemirror to 6.39.13 and enhance host switching

packages/ui/src/components/desktop/DesktopHostSwitcher.tsx

@@ -31,6 +31,7 @@ import {
   RiDeleteBinLine,
 } from '@remixicon/react';
 import { cn } from '@/lib/utils';
+import { toast } from '@/components/ui';
 import { isTauriShell, isDesktopShell } from '@/lib/desktop';
 import {
   desktopHostProbe,
@@ -160,6 +161,7 @@ export function DesktopHostSwitcherDialog({
   const [isLoading, setIsLoading] = React.useState(false);
   const [isProbing, setIsProbing] = React.useState(false);
   const [isSaving, setIsSaving] = React.useState(false);
+  const [switchingHostId, setSwitchingHostId] = React.useState<string | null>(null);
   const [error, setError] = React.useState<string>('');
 
   const [editingId, setEditingId] = React.useState<string | null>(null);
@@ -262,9 +264,25 @@ export function DesktopHostSwitcherDialog({
     void probeAll(allHosts);
   }, [open, allHosts, probeAll]);
 
-  const handleSwitch = React.useCallback((host: DesktopHost) => {
+  const handleSwitch = React.useCallback(async (host: DesktopHost) => {
     const origin = host.id === LOCAL_HOST_ID ? getLocalOrigin() : (normalizeHostUrl(host.url) || '');
     if (!origin) return;
+
+    if (host.id !== LOCAL_HOST_ID && isTauriShell()) {
+      setSwitchingHostId(host.id);
+      const probe = await desktopHostProbe(origin).catch((): HostProbeResult => ({ status: 'unreachable', latencyMs: 0 }));
+      setStatusById((prev) => ({
+        ...prev,
+        [host.id]: { status: probe.status, latencyMs: probe.latencyMs },
+      }));
+
+      if (probe.status === 'unreachable') {
+        toast.error(`Instance "${host.label}" is unreachable`);
+        setSwitchingHostId(null);
+        return;
+      }
+    }
+
     const target = toNavigationUrl(origin);
     onHostSwitched?.();
 
@@ -440,7 +458,8 @@ export function DesktopHostSwitcherDialog({
                         'flex items-center gap-2 flex-1 min-w-0 text-left',
                         isEditing && 'pointer-events-none opacity-70'
                       )}
-                      onClick={() => handleSwitch(host)}
+                      onClick={() => void handleSwitch(host)}
+                      disabled={switchingHostId === host.id}
                       aria-label={`Switch to ${host.label}`}
                     >
                       <span className={cn('h-2 w-2 rounded-full flex-shrink-0', statusDotClass(status?.status ?? null))} />