feat!: sensitive actions need a fresh passkey touch (elevation windows), plus login page hint cleanup [CI]

backend/shared/MoShiro.Protocol/MoShiroErrors.cs

@@ -11,6 +11,7 @@ public static class MoShiroErrors
     public static readonly ErrorCode CsrfFailed = new("csrf_failed");
     public static readonly ErrorCode Forbidden = new("forbidden");
     public static readonly ErrorCode SitePrivate = new("site_private");
+    public static readonly ErrorCode ElevationRequired = new("elevation_required");
     public static readonly ErrorCode NotFound = new("not_found");
     public static readonly ErrorCode AgentNotFound = new("agent_not_found");
     public static readonly ErrorCode ProbeNotFound = new("probe_not_found");