feat(ux): wizard handoff note, daemon restart reminder, settings polish (code)

The code changes intended with the settings_window removal in a90aa29 (a bad
git-add pathspec aborted staging them there, leaving that commit with only the
file deletions and CMakeLists still referencing them):
- First-run handoff info toast at the completion point.
- Daemon-updater "restart pending" reminder (Settings → Daemon Binary) + the
  Done screen's warning-level "restart required" headline.
- Debug restart-note raised to a readable color with the restart prompt beneath
  it; DEBUG OPTIONS header shows a lock + explanatory caption (auth gate
  unchanged); a few hardcoded literals → material tokens / dpiScale.
- Drop the legacy settings_window from the build (CMakeLists + the dev-only
  references) to match the file deletions.

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

src/app.cpp

@@ -36,7 +36,6 @@
 #include "ui/windows/explorer_tab.h"
 #include "ui/windows/seed_display.h"
 #include "ui/windows/market_tab.h"
-#include "ui/windows/settings_window.h"
 #include "ui/windows/about_dialog.h"
 #include "ui/windows/faq_dialog.h"
 #include "embedded/IconsMaterialDesign.h"
@@ -1963,6 +1962,12 @@ void App::render()
         }
         settings_->setWizardCompleted(true);
         settings_->save();
+        // Soften the abrupt handoff: tell the user the node is starting + will keep syncing in the
+        // background, instead of dropping them onto a busy/blank main window with no explanation.
+        if (!state_.connected)
+            ui::Notifications::instance().info(
+                settings_->getEncryptionPending() ? TR("wiz_handoff_encrypting") : TR("wiz_handoff_starting"),
+                10.0f);
     }
 
     // Process deferred encryption from wizard (runs in background)
@@ -2528,9 +2533,6 @@ void App::render()
     // content area, status bar, and every other widget in this window.
     // ====================================================================
     PERF_BEGIN(_perfDialogs);
-    if (show_settings_) {
-        ui::RenderSettingsWindow(this, &show_settings_);
-    }
 
     if (show_about_) {
         ui::RenderAboutDialog(this, &show_about_);
@@ -8182,6 +8184,7 @@ void App::restartDaemon()
         isUsingEmbeddedDaemon(), daemon_controller_ != nullptr, isEmbeddedDaemonRunning(), daemon_restarting_.load());
     if (!decision.allowed) return;
     if (refuseIfNodeBusy()) return;
+    daemon_restart_pending_.store(false);   // a restart is actually happening — clear the reminder
     daemon_restarting_ = true;
 
     daemon_controller_->prepareLifecycleOperation(decision, settings_.get());