feat(settings): migrate Export-Transactions-CSV modal to the reference design

Phase 1 (first modal). Bring the CSV export dialog onto the key-import reference:
- Struct-form OverlayDialogSpec / BlurFloat (was the legacy positional overload).
- material::DialogActionFooter (centered TactileButton pair) replacing the
  StyledButtons + the two ImGui::Separators.
- Full i18n: TR("close") and the success/error status now via TR (were hardcoded
  English); on success the saved path shows in a widgets::AddressCopyField with a
  green check.
- Add ExportTransactionsDialog::hide() + a modal-export-transactions sweep surface
  so the dialog is captured (it wasn't before).

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

src/app_sweep.cpp

@@ -19,6 +19,7 @@
 #include "ui/sidebar.h"
 #include "ui/windows/send_tab.h"
 #include "ui/windows/wallets_dialog.h"
+#include "ui/windows/export_transactions_dialog.h"
 #include "ui/windows/daemon_download_dialog.h"
 #include "ui/windows/xmrig_download_dialog.h"
 #include "ui/pages/settings_page.h"
@@ -266,6 +267,8 @@ void App::buildSweepCatalog()
         [](App& a) { a.import_view_mode_ = true; a.show_import_key_ = true; }, [](App& a) { a.show_import_key_ = false; a.import_view_mode_ = false; });
     add("modal-export-key", ui::NavPage::Overview,
         [](App& a) { a.show_export_key_ = true; }, [](App& a) { a.show_export_key_ = false; });
+    add("modal-export-transactions", ui::NavPage::Settings,
+        [](App&) { ui::ExportTransactionsDialog::show(); }, [](App&) { ui::ExportTransactionsDialog::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/export_transactions_dialog.cpp

@@ -9,7 +9,10 @@
 #include "../notifications.h"
 #include "../schema/ui_schema.h"
 #include "../material/draw_helpers.h"
+#include "../material/type.h"
+#include "../widgets/copy_field.h"
 #include "../theme.h"
+#include "../../embedded/IconsMaterialDesign.h"
 #include "imgui.h"
 
 #include <string>
@@ -24,7 +27,8 @@ namespace ui {
 // Static state
 static bool s_open = false;
 static char s_filename[256] = "";
-static std::string s_status;
+static std::string s_saved_path;   // full path on success (shown as a copy field); empty otherwise
+static std::string s_error;        // error message on failure; empty otherwise
 // Re-entrancy guard: true while a CSV write is in flight (disables the
 // Export button so a second synchronous write can't be kicked off).
 static bool s_exporting = false;
@@ -52,7 +56,8 @@ static std::string escapeCSV(const std::string& field)
 void ExportTransactionsDialog::show()
 {
     s_open = true;
-    s_status.clear();
+    s_saved_path.clear();
+    s_error.clear();
 
     // Generate default filename with timestamp
     std::time_t now = std::time(nullptr);
@@ -66,37 +71,60 @@ bool ExportTransactionsDialog::isOpen()
     return s_open;
 }
 
+void ExportTransactionsDialog::hide()
+{
+    s_open = false;
+    s_saved_path.clear();
+    s_error.clear();
+}
+
 void ExportTransactionsDialog::render(App* app)
 {
     if (!s_open) return;
+    namespace m = material;
 
-    auto& S = schema::UI();
+    m::OverlayDialogSpec ov;
-    auto win = S.window("dialogs.export-transactions");
+    ov.title     = TR("export_tx_title");
-    auto exportBtn = S.button("dialogs.export-transactions", "export-button");
+    ov.p_open    = &s_open;
-    auto closeBtn = S.button("dialogs.export-transactions", "close-button");
+    ov.style     = m::OverlayStyle::BlurFloat;
+    ov.cardWidth = 520.0f;
+    ov.idSuffix  = "exporttx";
+    if (!m::BeginOverlayDialog(ov)) return;
 
-    if (material::BeginOverlayDialog(TR("export_tx_title"), &s_open, win.width, 0.94f)) {
     const auto& state = app->getWalletState();
 
     ImGui::Text(TR("export_tx_count"), state.transactions.size());
-        
-        ImGui::Spacing();
-        ImGui::Separator();
     ImGui::Spacing();
 
-        // Filename
+    // Filename + save-location hint.
-        material::LabeledInput(TR("output_filename"), "##Filename", s_filename, sizeof(s_filename));
+    m::LabeledInput(TR("output_filename"), "##Filename", s_filename, sizeof(s_filename));
+    ImGui::Spacing();
+    ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(m::OnSurfaceDisabled()), "%s", TR("file_save_location"));
+
+    // Result — success shows the saved path as a copy field; failure shows a red line.
+    if (!s_saved_path.empty()) {
+        ImGui::Spacing();
+        ImGui::PushFont(m::Type().iconSmall());
+        ImGui::TextColored(m::SuccessVec4(), ICON_MD_CHECK_CIRCLE);
+        ImGui::PopFont();
+        ImGui::SameLine(0, 4.0f * Layout::dpiScale());
+        ImGui::TextColored(m::SuccessVec4(), "%s", TR("export_tx_success"));
+        widgets::AddressCopyField("##exportedpath", s_saved_path);
+    } else if (!s_error.empty()) {
+        ImGui::Spacing();
+        ImGui::PushTextWrapPos(0.0f);
+        ImGui::TextColored(ImVec4(0.8f, 0.3f, 0.3f, 1.0f), "%s", s_error.c_str());
+        ImGui::PopTextWrapPos();
+    }
 
     ImGui::Spacing();
-        ImGui::TextDisabled("%s", TR("file_save_location"));
 
-        ImGui::Spacing();
+    bool doExport = false, doClose = false;
-        ImGui::Separator();
+    m::DialogActionFooter(TR("export"), !s_exporting, TR("close"), doExport, doClose);
-        ImGui::Spacing();
+    if (doClose) s_open = false;
-        
+    if (doExport) {
-        // Export button (disabled while a write is already in flight)
+        s_saved_path.clear();
-        ImGui::BeginDisabled(s_exporting);
+        s_error.clear();
-        if (material::StyledButton(TR("export"), ImVec2(exportBtn.width, 0), S.resolveFont(exportBtn.font))) {
         if (state.transactions.empty()) {
             Notifications::instance().warning(TR("export_tx_none"));
         } else {
@@ -106,64 +134,33 @@ void ExportTransactionsDialog::render(App* app)
 
             std::ofstream file(filepath);
             if (!file.is_open()) {
-                    s_status = "Failed to create file";
+                s_error = TR("export_tx_file_fail");
                 Notifications::instance().error(TR("export_tx_file_fail"));
             } else {
-                    // Write CSV header
                 file << "Date,Type,Amount,Address,TXID,Confirmations,Memo\n";
-                    
-                    // Write transactions
                 for (const auto& tx : state.transactions) {
-                        // Date
                     std::time_t t = static_cast<std::time_t>(tx.timestamp);
                     char datebuf[32];
                     std::strftime(datebuf, sizeof(datebuf), "%Y-%m-%d %H:%M:%S", std::localtime(&t));
                     file << datebuf << ",";
-                        
-                        // Type
                     file << escapeCSV(tx.type) << ",";
-                        
-                        // Amount
                     std::ostringstream amt;
                     amt << std::fixed << std::setprecision(8) << tx.amount;
                     file << amt.str() << ",";
-                        
-                        // Address
                     file << escapeCSV(tx.address) << ",";
-                        
-                        // TXID
                     file << escapeCSV(tx.txid) << ",";
-                        
-                        // Confirmations
                     file << tx.confirmations << ",";
-                        
-                        // Memo
                     file << escapeCSV(tx.memo) << "\n";
                 }
-                    
                 file.close();
-                    
+                s_saved_path = filepath;
-                    s_status = "Exported " + std::to_string(state.transactions.size()) +
-                               " transactions to: " + filepath;
                 Notifications::instance().success(TR("export_tx_success"), 5.0f);
             }
             s_exporting = false;
         }
     }
-        ImGui::EndDisabled();
 
-        ImGui::SameLine();
+    m::EndOverlayDialog();
-        if (material::StyledButton("Close", ImVec2(closeBtn.width, 0), S.resolveFont(closeBtn.font))) {
-            s_open = false;
-        }
-        
-        // Status
-        if (!s_status.empty()) {
-            ImGui::Spacing();
-            ImGui::TextWrapped("%s", s_status.c_str());
-        }
-        material::EndOverlayDialog();
-    }
 }
 
 } // namespace ui

src/ui/windows/export_transactions_dialog.h

@@ -25,6 +25,9 @@ public:
     
     // Check if dialog is open
     static bool isOpen();
+
+    // Close the dialog (used by the UI sweep teardown)
+    static void hide();
 };
 
 } // namespace ui