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/export_all_keys_dialog.cpp

@@ -69,7 +69,11 @@ void ExportAllKeysDialog::render(App* app)
     auto exportBtn = S.button("dialogs.export-all-keys", "export-button");
     auto closeBtn = S.button("dialogs.export-all-keys", "close-button");
 
-    if (material::BeginOverlayDialog(TR("export_keys_title"), &s_open, win.width, 0.94f)) {
+    material::OverlayDialogSpec ov;
+    ov.title = TR("export_keys_title"); ov.p_open = &s_open;
+    ov.style = material::OverlayStyle::BlurFloat;   // floating content on the blur, plain heading
+    ov.cardWidth = win.width; ov.cardBottomViewportRatio = 0.94f;   // keep authored width
+    if (material::BeginOverlayDialog(ov)) {
         // Warning
         ImGui::PushStyleColor(ImGuiCol_Text, ImVec4(1.0f, 0.4f, 0.4f, 1.0f));
         ImGui::PushFont(material::Type().iconSmall());