feat(dashboard): clarify version-update loader copy

Update the version-hash reload loader message to "Updating to a new
frontend version..." so users understand it refers to the dashboard UI,
not a server/runtime upgrade.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/dashboard/app/components/DashboardLoader.tsx

@@ -55,7 +55,7 @@ export function DashboardLoader({ stage }: DashboardLoaderProps) {
         <h1 className="dashboard-loader__logo">Fusion</h1>
         {isVersionUpdate ? (
           <p className="dashboard-loader__message dashboard-loader__message--update">
-            Updating to a new version...
+            Updating to a new frontend version...
           </p>
         ) : (
           <p className="dashboard-loader__message">Initializing dashboard...</p>