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_wizard.cpp

@@ -1456,7 +1456,8 @@ void App::renderFirstRunWizard() {
                     wizard_phase_ = WizardPhase::Done;
                     settings_->setWizardCompleted(true);
                     settings_->save();
-                    ui::Notifications::instance().info(TR("wiz_encrypt_bg"));
+                    // The handoff toast is now emitted once at the completion point in app.cpp
+                    // (wiz_handoff_encrypting), so don't also toast here.
                 }
                 ImGui::EndDisabled();
                 ImGui::PopStyleVar();