feat(ui): float the remaining large dialogs (Phase 2 float rollout)

Per the user's selection, convert the large multi-section dialogs to the BlurFloat
style (floating content on the blur, plain heading, no glass card), each KEEPING
its authored width so width-coupled content is untouched:
- Export all keys, Console RPC reference, Explorer block detail
- Updater dialogs: daemon update, xmrig update, bootstrap download (multi-state)

Settings and Address book intentionally kept as cards (the modal Settings *window*
is dead code — show_settings_ is never set; the live Settings surface is the nav
page, not a modal; Address book has a nested edit that reads better contained).
All other confirm/input dialogs stay card-on-blur ("card for small"). Updater
dialogs are multi-state — GUI-check each state (confirm/progress/done/failed).

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

src/ui/windows/console_tab.cpp

@@ -1341,7 +1341,11 @@ void ConsoleTab::renderCommandsPopup()
     using namespace material;
     
     float popW = std::min(schema::UI().drawElement("tabs.console", "popup-max-width").size, ImGui::GetMainViewport()->Size.x * schema::UI().drawElement("tabs.console", "popup-width-ratio").size);
-    if (!material::BeginOverlayDialog(TR("console_rpc_reference"), &show_commands_popup_, popW, 0.94f)) {
+    material::OverlayDialogSpec ov;
+    ov.title = TR("console_rpc_reference"); ov.p_open = &show_commands_popup_;
+    ov.style = material::OverlayStyle::BlurFloat;   // floating content on the blur, plain heading
+    ov.cardWidth = popW; ov.cardBottomViewportRatio = 0.94f;   // keep authored width
+    if (!material::BeginOverlayDialog(ov)) {
         return;
     }