feat(settings): confirmation modals for rescan and restart-daemon

The Rescan blockchain and Restart daemon buttons fired immediately on click —
both are disruptive (long offline rescan / connection drop) and easy to hit by
accident. Route them through confirmation modals, matching the existing
delete-blockchain / clear-ztx confirmations: the button now sets a confirm flag
and an overlay dialog performs the action only on explicit confirm. New i18n
strings added with English defaults.

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

src/ui/pages/settings_page.cpp

@@ -145,6 +145,8 @@ struct SettingsPageState {
     bool tools_expanded = false;
     bool confirm_clear_ztx = false;
     bool confirm_delete_blockchain = false;
+    bool confirm_rescan = false;
+    bool confirm_restart_daemon = false;
     effects::ScrollFadeShader fade_shader;
 };
 
@@ -1993,7 +1995,7 @@ void RenderSettingsPage(App* app) {
                     if (ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled)) ImGui::SetTooltip("%s", TR("tt_test_conn"));
                     ImGui::SameLine(0, Layout::spacingMd());
                     if (TactileButton(TR("rescan"), ImVec2(nodeBtnW, 0), btnFont)) {
-                        app->rescanBlockchain();
+                        s_settingsState.confirm_rescan = true;
                     }
                     if (ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled)) ImGui::SetTooltip("%s", TR("tt_rescan"));
                     ImGui::EndDisabled();
@@ -2451,8 +2453,7 @@ void RenderSettingsPage(App* app) {
                 ImGui::PopStyleColor();
                 ImGui::SameLine();
                 if (TactileButton(TR("settings_restart_daemon"), ImVec2(0, 0), S.resolveFont("button"))) {
-                    s_settingsState.debug_cats_dirty = false;
+                    s_settingsState.confirm_restart_daemon = true;
-                    app->restartDaemon();
                 }
                 if (ImGui::IsItemHovered()) ImGui::SetTooltip("%s", TR("tt_restart_daemon"));
             }
@@ -2580,6 +2581,65 @@ void RenderSettingsPage(App* app) {
         }
     }
 
+    // Confirm: rescan blockchain (restarts the daemon, re-scans the whole chain — long but safe)
+    if (s_settingsState.confirm_rescan) {
+        if (BeginOverlayDialog(TR("confirm_rescan_title"), &s_settingsState.confirm_rescan, 500.0f, 0.94f)) {
+            ImGui::PushFont(Type().iconLarge());
+            ImGui::TextColored(ImVec4(1.0f, 0.8f, 0.2f, 1.0f), ICON_MD_WARNING);
+            ImGui::PopFont();
+            ImGui::SameLine();
+            ImGui::TextColored(ImVec4(1.0f, 0.8f, 0.2f, 1.0f), "%s", TR("warning"));
+
+            ImGui::Spacing();
+            ImGui::TextWrapped("%s", TR("confirm_rescan_msg"));
+            ImGui::Spacing();
+            ImGui::TextColored(ImVec4(0.3f, 0.8f, 0.3f, 1.0f), "%s", TR("confirm_rescan_safe"));
+            ImGui::Spacing();
+            ImGui::Separator();
+            ImGui::Spacing();
+
+            float btnW = (ImGui::GetContentRegionAvail().x - ImGui::GetStyle().ItemSpacing.x) * 0.5f;
+            if (ImGui::Button(TrId("cancel", "rescan_cancel").c_str(), ImVec2(btnW, 40))) {
+                s_settingsState.confirm_rescan = false;
+            }
+            ImGui::SameLine();
+            if (ImGui::Button(TrId("rescan", "rescan_confirm").c_str(), ImVec2(btnW, 40))) {
+                app->rescanBlockchain();
+                s_settingsState.confirm_rescan = false;
+            }
+            EndOverlayDialog();
+        }
+    }
+
+    // Confirm: restart daemon (briefly drops the connection to apply changed options)
+    if (s_settingsState.confirm_restart_daemon) {
+        if (BeginOverlayDialog(TR("confirm_restart_daemon_title"), &s_settingsState.confirm_restart_daemon, 500.0f, 0.94f)) {
+            ImGui::PushFont(Type().iconLarge());
+            ImGui::TextColored(ImVec4(1.0f, 0.8f, 0.2f, 1.0f), ICON_MD_WARNING);
+            ImGui::PopFont();
+            ImGui::SameLine();
+            ImGui::TextColored(ImVec4(1.0f, 0.8f, 0.2f, 1.0f), "%s", TR("warning"));
+
+            ImGui::Spacing();
+            ImGui::TextWrapped("%s", TR("confirm_restart_daemon_msg"));
+            ImGui::Spacing();
+            ImGui::Separator();
+            ImGui::Spacing();
+
+            float btnW = (ImGui::GetContentRegionAvail().x - ImGui::GetStyle().ItemSpacing.x) * 0.5f;
+            if (ImGui::Button(TrId("cancel", "restartd_cancel").c_str(), ImVec2(btnW, 40))) {
+                s_settingsState.confirm_restart_daemon = false;
+            }
+            ImGui::SameLine();
+            if (ImGui::Button(TrId("settings_restart_daemon", "restartd_confirm").c_str(), ImVec2(btnW, 40))) {
+                s_settingsState.debug_cats_dirty = false;
+                app->restartDaemon();
+                s_settingsState.confirm_restart_daemon = false;
+            }
+            EndOverlayDialog();
+        }
+    }
+
 }
 
 } // namespace ui

src/util/i18n.cpp

@@ -413,6 +413,11 @@ void I18n::loadBuiltinEnglish()
         strings_["confirm_delete_blockchain_title"] = "Delete Blockchain Data";
         strings_["confirm_delete_blockchain_msg"] = "This will stop the daemon, delete all blockchain data (blocks, chainstate, peers), and start a fresh sync from scratch. This can take several hours to complete.";
         strings_["confirm_delete_blockchain_safe"] = "Your wallet.dat, config, and transaction history are safe and will not be deleted.";
+        strings_["confirm_rescan_title"] = "Rescan Blockchain";
+        strings_["confirm_rescan_msg"] = "This restarts the daemon and re-scans the entire blockchain for your wallet's transactions. It can take a long time and the wallet stays offline until it finishes.";
+        strings_["confirm_rescan_safe"] = "Your wallet.dat and blockchain data are not deleted — only re-scanned.";
+        strings_["confirm_restart_daemon_title"] = "Restart Daemon";
+        strings_["confirm_restart_daemon_msg"] = "This stops and restarts the daemon to apply the changed options. The wallet will briefly disconnect and reconnect.";
         strings_["tt_encrypt"] = "Encrypt wallet.dat with a passphrase";
         strings_["tt_change_pass"] = "Change the wallet encryption passphrase";
         strings_["tt_lock"] = "Lock the wallet immediately";