fix(ux): land quick-win UX audit fixes across settings, exports, toasts, nav

Batch of safe, isolated fixes from the 10-surface UX audit:

- settings: Auto-shield / Save-z-transactions toggles now persist on change
  (they discarded CB()'s return and relied on a Save button that only renders
  on the About tab, so the choice was silently lost on relaunch).
- exports: show the resolved Platform::getConfigDir() instead of a hardcoded
  ~/.config path (wrong on Windows/macOS) in both the all-keys and CSV
  dialogs; all-keys also reveals the file path on a partial export.
- notifications: error/warning toasts last 9s/7s (were 4s/3.5s) so failures
  are readable.
- qr popup / tx-details: copy-to-clipboard now confirms with a toast.
- about: Escape-to-close + readable heading contrast via OnSurfaceMedium().
- sidebar: suppress single-key nav (J/K/arrows/[) while an overlay dialog or
  ImGui popup is open, so it no longer switches the tab behind a modal.
- i18n: strip the stale hardcoded path out of file_save_location in i18n.cpp
  and all eight res/lang/*.json locales (additive, one key each).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

res/lang/de.json

@@ -876,7 +876,7 @@
     "fee_normal": "Normal",
     "fetch_prices": "Preise abrufen",
     "file": "Datei",
-    "file_save_location": "Datei wird gespeichert in: ~/.config/ObsidianDragon/",
+    "file_save_location": "Datei wird gespeichert in:",
     "filter": "Filtern...",
     "font_scale": "Schriftgröße",
     "from": "Von",

res/lang/es.json

@@ -876,7 +876,7 @@
     "fee_normal": "Normal",
     "fetch_prices": "Obtener precios",
     "file": "Archivo",
-    "file_save_location": "El archivo se guardará en: ~/.config/ObsidianDragon/",
+    "file_save_location": "El archivo se guardará en:",
     "filter": "Filtrar...",
     "font_scale": "Escala de fuente",
     "from": "Desde",

res/lang/fr.json

@@ -876,7 +876,7 @@
     "fee_normal": "Normal",
     "fetch_prices": "Récupérer les prix",
     "file": "Fichier",
-    "file_save_location": "Le fichier sera enregistré dans : ~/.config/ObsidianDragon/",
+    "file_save_location": "Le fichier sera enregistré dans :",
     "filter": "Filtrer...",
     "font_scale": "Taille de police",
     "from": "De",

res/lang/ja.json

@@ -876,7 +876,7 @@
     "fee_normal": "通常",
     "fetch_prices": "価格を取得",
     "file": "ファイル",
-    "file_save_location": "ファイルの保存先：~/.config/ObsidianDragon/",
+    "file_save_location": "ファイルの保存先：",
     "filter": "フィルター...",
     "font_scale": "フォントサイズ",
     "from": "送信元",

res/lang/ko.json

@@ -876,7 +876,7 @@
     "fee_normal": "보통",
     "fetch_prices": "가격 조회",
     "file": "파일",
-    "file_save_location": "파일 저장 위치: ~/.config/ObsidianDragon/",
+    "file_save_location": "파일 저장 위치:",
     "filter": "필터...",
     "font_scale": "글꼴 크기",
     "from": "보낸 곳",

res/lang/pt.json

@@ -876,7 +876,7 @@
     "fee_normal": "Normal",
     "fetch_prices": "Buscar preços",
     "file": "Arquivo",
-    "file_save_location": "O arquivo será salvo em: ~/.config/ObsidianDragon/",
+    "file_save_location": "O arquivo será salvo em:",
     "filter": "Filtrar...",
     "font_scale": "Escala da Fonte",
     "from": "De",

res/lang/ru.json

@@ -876,7 +876,7 @@
     "fee_normal": "Обычная",
     "fetch_prices": "Получить цены",
     "file": "Файл",
-    "file_save_location": "Файл будет сохранён в: ~/.config/ObsidianDragon/",
+    "file_save_location": "Файл будет сохранён в:",
     "filter": "Фильтр...",
     "font_scale": "Масштаб шрифта",
     "from": "От",

res/lang/zh.json

@@ -876,7 +876,7 @@
     "fee_normal": "普通",
     "fetch_prices": "获取价格",
     "file": "文件",
-    "file_save_location": "文件将保存至：~/.config/ObsidianDragon/",
+    "file_save_location": "文件将保存至：",
     "filter": "筛选...",
     "font_scale": "字体大小",
     "from": "从",

res/themes/ui.toml

@@ -1229,8 +1229,8 @@ glass-border-alpha = { size = 35.0 }
 progress-bar-height = { size = 2.0 }
 duration-info = { size = 1.0 }
 duration-success = { size = 2.5 }
-duration-warning = { size = 3.5 }
-duration-error = { size = 4.0 }
+duration-warning = { size = 7.0 }
+duration-error = { size = 9.0 }
 window = { width = 350, height = 60, border-radius = 8, border-width = 1 }
 viewport-padding = { size = 20.0 }
 stack-gap = { size = 10.0 }

src/ui/pages/settings_page.cpp

@@ -1298,9 +1298,14 @@ void RenderSettingsPage(App* app) {
                 if (c == 1) { rowY += fh + gp; c = 0; } else { c = 1; }
                 return changed;
             };
-            CB(TrId("save_z_transactions", "save_ztx"), &s_settingsState.save_ztxs);
+            // These persist immediately on toggle (like the daemon/verbose options below). The old
+            // code discarded CB()'s return and relied on a Save button that only renders on the About
+            // tab, so a user who enabled Auto-shield (a money/privacy intent) silently lost it on relaunch.
+            if (CB(TrId("save_z_transactions", "save_ztx"), &s_settingsState.save_ztxs))
+                saveSettingsPageState(app->settings());
             if (ImGui::IsItemHovered()) material::Tooltip("%s", TR("tt_save_ztx"));
-            CB(TrId("auto_shield", "auto_shld"), &s_settingsState.auto_shield);
+            if (CB(TrId("auto_shield", "auto_shld"), &s_settingsState.auto_shield))
+                saveSettingsPageState(app->settings());
             if (ImGui::IsItemHovered()) material::Tooltip("%s", TR("tt_auto_shield"));
             {
                 // Not implemented: disabled and never shown as "on", even for a stored use_tor=true.

src/ui/sidebar.h

@@ -763,7 +763,11 @@ inline bool RenderSidebar(NavPage& current, float sidebarWidth, float contentHei
     }
 
     // ---- Keyboard navigation ----
-    if (!ImGui::GetIO().WantTextInput && !ImGui::GetIO().KeyCtrl) {
+    // Suppress single-key nav while a dialog/overlay (send-confirm, seed backup, unlock, …) or any
+    // ImGui popup is open — otherwise Arrow/J/K/[ silently switch the tab *behind* the modal.
+    if (!ImGui::GetIO().WantTextInput && !ImGui::GetIO().KeyCtrl &&
+        !material::IsOverlayDialogBlockingInput() &&
+        !ImGui::IsPopupOpen(nullptr, ImGuiPopupFlags_AnyPopup)) {
         int idx = static_cast<int>(current);
         bool nav = false;
         if (ImGui::IsKeyPressed(ImGuiKey_UpArrow) || ImGui::IsKeyPressed(ImGuiKey_K)) {

src/ui/windows/about_dialog.cpp

@@ -38,6 +38,12 @@ void RenderAboutDialog(App* app, bool* p_open)
         return;
     }
 
+    // Escape closes the dialog (click-outside and the Close button already work; this matches the FAQ
+    // dialog's affordance so Escape behaves consistently across modal dialogs).
+    if (ImGui::IsKeyPressed(ImGuiKey_Escape)) {
+        *p_open = false;
+    }
+
     // Use Body2 font for all dialog text
     ImGui::PushFont(Type().body2());
 
@@ -107,7 +113,7 @@ void RenderAboutDialog(App* app, bool* p_open)
     ImGui::Spacing();
     
     // Credits
-    ImGui::TextColored(ImVec4(0.7f, 0.7f, 0.7f, 1.0f), "%s", TR("about_credits"));
+    ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(material::OnSurfaceMedium()), "%s", TR("about_credits"));
     ImGui::Spacing();
     
     ImGui::BulletText("The Hush Developers");
@@ -121,7 +127,7 @@ void RenderAboutDialog(App* app, bool* p_open)
     ImGui::Spacing();
     
     // License
-    ImGui::TextColored(ImVec4(0.7f, 0.7f, 0.7f, 1.0f), "%s", TR("about_license"));
+    ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(material::OnSurfaceMedium()), "%s", TR("about_license"));
     ImGui::Spacing();
     ImGui::TextWrapped("%s", TR("about_license_text"));
     

src/ui/windows/export_all_keys_dialog.cpp

@@ -93,7 +93,10 @@ void ExportAllKeysDialog::render(App* app)
         ImGui::Spacing();
         m::LabeledInput(TR("output_filename"), "##Filename", s_filename, sizeof(s_filename));
         ImGui::Spacing();
-        ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(m::OnSurfaceDisabled()), "%s", TR("file_save_location"));
+        // Show the real, resolved config directory (not a hardcoded ~/.config path, which was wrong on
+        // Windows/macOS) so the user knows where this plaintext key file lands before they export it.
+        ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(m::OnSurfaceDisabled()), "%s %s",
+                           TR("file_save_location"), util::Platform::getConfigDir().c_str());
         ImGui::EndDisabled();
 
         // Progress / result.
@@ -232,7 +235,10 @@ void ExportAllKeysDialog::render(App* app)
                                 Notifications::instance().error(TR("export_keys_write_fail"));
                             } else if (exported < total) {
                                 snprintf(buf, sizeof(buf), TR("export_keys_partial"), exported, total);
-                                s_status = buf;
+                                // A partial export still wrote a plaintext key file to disk — show WHERE,
+                                // so the user can find it to move or delete it (previously only a full
+                                // success revealed the path, leaving partial-export files orphaned).
+                                s_status = std::string(buf) + "\n" + filepath;
                                 snprintf(buf, sizeof(buf), TR("export_keys_partial_toast"), exported, total);
                                 Notifications::instance().warning(buf);
                             } else {

src/ui/windows/export_transactions_dialog.cpp

@@ -81,7 +81,9 @@ void ExportTransactionsDialog::render(App* app)
     // Filename + save-location hint.
     m::LabeledInput(TR("output_filename"), "##Filename", s_filename, sizeof(s_filename));
     ImGui::Spacing();
-    ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(m::OnSurfaceDisabled()), "%s", TR("file_save_location"));
+    // Show the real, resolved config directory (the old hardcoded ~/.config path was wrong on Windows/macOS).
+    ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(m::OnSurfaceDisabled()), "%s %s",
+                       TR("file_save_location"), util::Platform::getConfigDir().c_str());
 
     // Result — success shows the saved path as a copy field; failure shows a red line.
     if (!s_saved_path.empty()) {

src/ui/windows/qr_popup_dialog.cpp

@@ -11,6 +11,7 @@
 #include "../material/draw_helpers.h"
 #include "../layout.h"
 #include "../theme.h"
+#include "../notifications.h"
 #include "imgui.h"
 
 namespace dragonx {
@@ -138,6 +139,9 @@ void QRPopupDialog::render(App* app)
         material::DialogActionFooter(TR("copy_address"), true, TR("close"), doCopy, doClose, btnW);
         if (doCopy) {
             ImGui::SetClipboardText(s_address.c_str());
+            // Confirm the copy — a silent copy here risks a stale clipboard being pasted into an
+            // exchange withdrawal. Matches the Receive tab's feedback.
+            Notifications::instance().info(TR("address_copied"));
         }
         if (doClose) {
             close();

src/ui/windows/transaction_details_dialog.cpp

@@ -10,6 +10,7 @@
 #include "../theme.h"
 #include "../schema/ui_schema.h"
 #include "../material/draw_helpers.h"
+#include "../notifications.h"
 #include "imgui.h"
 #include <ctime>
 
@@ -126,6 +127,7 @@ void TransactionDetailsDialog::render(App* app)
         ImGui::SameLine();
         if (material::StyledButton((std::string(TR("grpb_copy")) + "##TxID").c_str(), ImVec2(copyBtn.width, 0), S.resolveFont(copyBtn.font))) {
             ImGui::SetClipboardText(tx.txid.c_str());
+            Notifications::instance().info(TR("copied_to_clipboard"));
         }
 
         ImGui::Spacing();
@@ -152,6 +154,7 @@ void TransactionDetailsDialog::render(App* app)
             ImGui::SameLine();
             if (material::StyledButton((std::string(TR("grpb_copy")) + "##Addr").c_str(), ImVec2(copyBtn.width, 0), S.resolveFont(copyBtn.font))) {
                 ImGui::SetClipboardText(tx.address.c_str());
+                Notifications::instance().info(TR("copied_to_clipboard"));
             }
         }
 

src/util/i18n.cpp

@@ -1606,7 +1606,7 @@ void I18n::loadBuiltinEnglish()
         strings_["date_label"] = "Date:";
         strings_["delete"] = "Delete";
         strings_["fee_label"] = "Fee:";
-        strings_["file_save_location"] = "File will be saved in: ~/.config/ObsidianDragon/";
+        strings_["file_save_location"] = "File will be saved in:";
         strings_["hide"] = "Hide";
         strings_["label"] = "Label:";
         strings_["loading"] = "Loading...";