feat(settings): merge BACKUP & DATA into the WALLET card

Move the Backup & Data button row (Import/Export key, Export all, Backup, Export
CSV, and the full-node Download Bootstrap / Setup Wizard) into the WALLET card as
a "Backup & Data" sub-section under the privacy toggles + Tools & Actions, and
delete the standalone BACKUP & DATA card (its own glass panel + header). One
fewer top-level card; all actions preserved.

Full-node build clean; hygiene clean.

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

src/ui/pages/settings_page.cpp

@@ -1366,45 +1366,14 @@ void RenderSettingsPage(App* app) {
             if (ImGui::IsItemHovered()) material::Tooltip("%s", TR("tt_clear_ztx"));
         }
 
-        ImGui::Dummy(ImVec2(0, bottomPad));
+        // --- Backup & Data (merged in from its former standalone card) ---
-        ImGui::Unindent(pad);
+        ImGui::Dummy(ImVec2(0, Layout::spacingMd()));
-
-        ImVec2 cardMax(cardMin.x + availWidth, ImGui::GetCursorScreenPos().y);
-        dl->ChannelsSetCurrent(0);
-        DrawGlassPanel(dl, cardMin, cardMax, glassSpec);
-        dl->ChannelsMerge();
-
-        ImGui::SetCursorScreenPos(ImVec2(cardMin.x, cardMax.y));
-        ImGui::Dummy(ImVec2(availWidth, 0));
-    }
-
-    ImGui::Dummy(ImVec2(0, gap));
-
-    // ====================================================================
-    // BACKUP & DATA — card
-    // ====================================================================
-    {
         Type().textColored(TypeStyle::Overline, OnSurfaceMedium(), TR("backup_data"));
         ImGui::Dummy(ImVec2(0, Layout::spacingXs()));
-
-        ImVec2 cardMin = ImGui::GetCursorScreenPos();
-        dl->ChannelsSplit(2);
-        dl->ChannelsSetCurrent(1);
-        ImGui::SetCursorScreenPos(ImVec2(cardMin.x, cardMin.y + pad));
-        ImGui::Indent(pad);
-
-        float contentW = availWidth - pad * 2;
-        float btnPad = S.drawElement("components.settings-page", "wallet-btn-padding").sizeOr(24.0f);
-
         {
+            float btnPad = S.drawElement("components.settings-page", "wallet-btn-padding").sizeOr(24.0f);
             const char* r1[] = {TR("settings_import_key"), TR("settings_export_key"), TR("settings_export_all"), TR("settings_backup"), TR("settings_export_csv")};
-            const char* t1[] = {
+            const char* t1[] = { TR("tt_import_key"), TR("tt_export_key"), TR("tt_export_all"), TR("tt_backup"), TR("tt_export_csv") };
-                TR("tt_import_key"),
-                TR("tt_export_key"),
-                TR("tt_export_all"),
-                TR("tt_backup"),
-                TR("tt_export_csv")
-            };
             const bool showFullNodeLifecycleActions = app->supportsFullNodeLifecycleActions();
             const char* wizLabel = TR("setup_wizard");
             const char* bsLabel = TR("download_bootstrap");
@@ -1422,7 +1391,6 @@ void RenderSettingsPage(App* app) {
 
             float scale = (totalW > contentW) ? contentW / totalW : 1.0f;
             if (scale < 1.0f) ImGui::SetWindowFontScale(scale);
-
             float scaledSp = sp * scale;
 
             if (TactileButton(r1[0], ImVec2(0, 0), btnFont))
@@ -1446,7 +1414,7 @@ void RenderSettingsPage(App* app) {
             if (ImGui::IsItemHovered()) material::Tooltip("%s", t1[4]);
 
             if (showFullNodeLifecycleActions) {
-                // Right-align Setup Wizard + Download Bootstrap
+                // Right-align Setup Wizard + Download Bootstrap.
                 float framePadX2 = ImGui::GetStyle().FramePadding.x * 2.0f;
                 float curX = ImGui::GetCursorScreenPos().x;
                 float wizBtnW = ImGui::CalcTextSize(wizLabel).x + framePadX2;
@@ -1486,6 +1454,7 @@ void RenderSettingsPage(App* app) {
 
     ImGui::Dummy(ImVec2(0, gap));
 
+
     // ====================================================================
     // NODE & SECURITY — card
     // ====================================================================