feat: update backup routes and navigation links for consistency

webapp/src/components/AppAuthenticatedShell.tsx

@@ -87,7 +87,7 @@ export default function AppAuthenticatedShell(props: AppAuthenticatedShellProps)
               <span>{t('nav_device_management')}</span>
             </Link>
             {props.profile?.role === 'admin' && (
-              <Link href="/help" className={`side-link ${props.location === '/help' ? 'active' : ''}`}>
+              <Link href="/backup" className={`side-link ${props.location === '/backup' ? 'active' : ''}`}>
                 <Cloud size={16} />
                 <span>{t('nav_backup_strategy')}</span>
               </Link>

webapp/src/components/AppMainRoutes.tsx

@@ -1,4 +1,5 @@
 import { lazy, Suspense } from 'preact/compat';
+import { useEffect } from 'preact/hooks';
 import { Link, Route, Switch } from 'wouter';
 import { ArrowUpDown, Cloud, LogOut, Settings as SettingsIcon, Shield, ShieldUser } from 'lucide-preact';
 import type { ImportAttachmentFile, ImportResultSummary } from '@/components/ImportPage';
@@ -21,6 +22,13 @@ function RouteContentFallback() {
   return <div className="loading-screen">{t('txt_loading_nodewarden')}</div>;
 }
 
+function LegacyBackupRedirect(props: { onNavigate: (path: string) => void }) {
+  useEffect(() => {
+    props.onNavigate('/backup');
+  }, [props]);
+  return null;
+}
+
 export interface AppMainRoutesProps {
   profile: Profile | null;
   session: SessionState | null;
@@ -232,7 +240,7 @@ export default function AppMainRoutes(props: AppMainRoutesProps) {
                 </Link>
               )}
               {props.profile.role === 'admin' && (
-                <Link href="/help" className="mobile-settings-link">
+                <Link href="/backup" className="mobile-settings-link">
                   <Cloud size={18} />
                   <span>{t('nav_backup_strategy')}</span>
                 </Link>
@@ -299,6 +307,9 @@ export default function AppMainRoutes(props: AppMainRoutesProps) {
         </Route>
       ))}
       <Route path="/help">
+        <LegacyBackupRedirect onNavigate={props.onNavigate} />
+      </Route>
+      <Route path="/backup">
         {props.profile?.role === 'admin' ? (
           <div className="stack">
             {props.mobileLayout && (