chore(sweep): add modal-bootstrap surface for the standalone bootstrap dialog

The settings-triggered BootstrapDownloadDialog wasn't captured (only the wizard's
bootstrap page was). Add BootstrapDownloadDialog::hide() + a modal-bootstrap sweep
surface (opens the confirm screen) so the migrated dialog is verifiable.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app_sweep.cpp

@@ -21,6 +21,7 @@
 #include "ui/windows/wallets_dialog.h"
 #include "ui/windows/export_transactions_dialog.h"
 #include "ui/windows/export_all_keys_dialog.h"
+#include "ui/windows/bootstrap_download_dialog.h"
 #include "ui/windows/daemon_download_dialog.h"
 #include "ui/windows/xmrig_download_dialog.h"
 #include "ui/pages/settings_page.h"
@@ -272,6 +273,8 @@ void App::buildSweepCatalog()
         [](App&) { ui::ExportTransactionsDialog::show(); }, [](App&) { ui::ExportTransactionsDialog::hide(); });
     add("modal-export-all-keys", ui::NavPage::Settings,
         [](App&) { ui::ExportAllKeysDialog::show(); }, [](App&) { ui::ExportAllKeysDialog::hide(); });
+    add("modal-bootstrap", ui::NavPage::Settings,
+        [](App& a) { ui::BootstrapDownloadDialog::show(&a); }, [](App&) { ui::BootstrapDownloadDialog::hide(); });
     add("modal-backup", ui::NavPage::Overview,
         [](App& a) { a.show_backup_ = true; }, [](App& a) { a.show_backup_ = false; a.backup_status_.clear(); });
     add("modal-about", ui::NavPage::Overview,

src/ui/windows/bootstrap_download_dialog.h

@@ -47,6 +47,9 @@ public:
 
     static bool isOpen() { return s_open; }
 
+    // Close the dialog (used by the UI sweep teardown).
+    static void hide() { s_open = false; s_state = State::Confirm; }
+
     static void render() {
         if (!s_app) return;
         if (!s_open) {