Fix cloud features staying off after login when the setup wizard was closed

Reported on #15239: after signing in to Orca Cloud on a fresh install, no sync
prompt appears and File > Sync Presets is greyed out with nothing to explain why.

CAUSE. AppConfig::get_stealth_mode() returns true whenever `firstguide/finish` is
unset, and that flag is written in exactly one place — GuideFrame::SaveProfile(),
i.e. only when the setup wizard is COMPLETED. Closing the wizard is what people do
today to reach the login (the wizard never offers it, which is #15239 itself), so a
new user ends up permanently in a stealth mode they never chose. Every cloud gate
keyed on get_stealth_mode() then switches off silently, including:

  * GUI_App::on_user_login_handle(), which returns EARLY on stealth — so the whole
    post-login flow is skipped: preset migration, plugin fetch, user-preset load and
    show_sync_dialog(). That is the missing sync prompt.
  * the Sync Presets item in both the top menu and the File menu, whose enable
    lambda was `is_user_login() && !get_stealth_mode()`. That is the greyed item.

The result is indistinguishable from real Stealth mode, and nothing in the UI says
so, because the one place that DOES explain it — the "Quit Stealth Mode" dialog in
handle_web_request() — only covers the homepage login commands.

FIX, two parts.

1. The pre-wizard value is a DEFAULT for "the user has not been asked yet", not a
   setting, so it must not survive the user answering. Signing in to a cloud account
   is that answer. AppConfig now carries a session-only `m_cloud_logged_in` mirrored
   from the network agent (on login, on logout, and at agent start so a restored
   session counts), and get_stealth_mode() consults it before falling back to the
   pre-wizard default. An explicit Stealth mode setting is untouched and still wins:
   a user who turned it on deliberately stays offline whether or not they sign in.

2. Sync Presets no longer greys itself out. Both refusal paths already had a message
   to show — "You must be logged in…" and now one for Stealth mode naming the
   Preferences toggle — and the enable lambda was making both unreachable. A disabled
   item that cannot say why is the reason this took a bug report to find.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/slic3r/GUI/GUI_App.cpp

@@ -3834,6 +3834,10 @@ bool GUI_App::on_init_network(bool try_backup)
         std::string country_code = app_config->get_country_code();
         m_agent->set_country_code(country_code);
         m_agent->start();
+        // A session restored from a saved token fires no login event, so seed the flag here too —
+        // otherwise the pre-wizard stealth default would come back on the next launch for a user
+        // who is already signed in.
+        app_config->set_cloud_logged_in(m_agent->is_user_login(ORCA_CLOUD_PROVIDER));
         // Orca: disable Bambu telemetry up-front (before any login) so it never starts.
         check_track_enable();
     }
@@ -5003,6 +5007,7 @@ void GUI_App::request_user_logout(const std::string& provider/* = ORCA_CLOUD_PRO
 {
     if (m_agent && m_agent->is_user_login(provider)) {
         m_agent->user_logout(true, provider);
+        app_config->set_cloud_logged_in(m_agent->is_user_login(ORCA_CLOUD_PROVIDER));
 
         if (provider == get_printer_cloud_provider()) {
             m_agent->set_user_selected_machine("");
@@ -5588,6 +5593,12 @@ void GUI_App::on_update_machine_list(wxCommandEvent &evt)
 void GUI_App::on_user_login_handle(wxCommandEvent &evt)
 {
     if (!m_agent) { return; }
+    // Tell AppConfig a cloud account is signed in BEFORE asking about stealth: an unfinished setup
+    // wizard makes get_stealth_mode() report stealth by default, and without this the early return
+    // below would swallow the whole post-login flow — presets, plugins and the sync prompt — for
+    // anyone who closed the wizard and signed in afterwards. An explicit Stealth mode setting is
+    // unaffected and still returns here.
+    app_config->set_cloud_logged_in(m_agent->is_user_login(ORCA_CLOUD_PROVIDER));
     if (app_config->get_stealth_mode()) {
         BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ": stealth mode enabled, skipping cloud connection";
         return;

src/slic3r/GUI/MainFrame.cpp

@@ -3402,14 +3402,22 @@ void MainFrame::init_menubar_as_editor()
                 info_dlg.ShowModal();
                 return;
             }
+            if (wxGetApp().app_config->get_stealth_mode()) {
+                MessageDialog info_dlg(this,
+                    _L("Stealth mode is on, so Orca Cloud syncing is switched off. "
+                       "Turn Stealth mode off in Preferences to sync your presets."),
+                    _L("Sync Presets"), wxOK | wxICON_INFORMATION);
+                info_dlg.ShowModal();
+                return;
+            }
             if (m_plater)
                 m_plater->get_notification_manager()->push_notification(
                     into_u8(_L("Syncing presets from cloud\u2026")));
             wxGetApp().restart_sync_user_preset();
         }, "", nullptr,
-        [this]() {
-            return wxGetApp().is_user_login() && !wxGetApp().app_config->get_stealth_mode();
-        }, this);
+        // Stays ENABLED whatever the cloud state: both refusals above name their reason, and a
+        // greyed-out item names none. A user who could not sync had no way to find out why.
+        []() { return true; }, this);
 
     top_menu->AppendSeparator();
     append_menu_item(
@@ -3539,14 +3547,22 @@ void MainFrame::init_menubar_as_editor()
                 info_dlg.ShowModal();
                 return;
             }
+            if (wxGetApp().app_config->get_stealth_mode()) {
+                MessageDialog info_dlg(this,
+                    _L("Stealth mode is on, so Orca Cloud syncing is switched off. "
+                       "Turn Stealth mode off in Preferences to sync your presets."),
+                    _L("Sync Presets"), wxOK | wxICON_INFORMATION);
+                info_dlg.ShowModal();
+                return;
+            }
             if (m_plater)
                 m_plater->get_notification_manager()->push_notification(
                     into_u8(_L("Syncing presets from cloud\u2026")));
             wxGetApp().restart_sync_user_preset();
         }, "", nullptr,
-        [this]() {
-            return wxGetApp().is_user_login() && !wxGetApp().app_config->get_stealth_mode();
-        }, this);
+        // Stays ENABLED whatever the cloud state: both refusals above name their reason, and a
+        // greyed-out item names none. A user who could not sync had no way to find out why.
+        []() { return true; }, this);
 
     fileMenu->AppendSeparator();
     append_menu_item(