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/ui/windows/daemon_download_dialog.h

@@ -445,11 +445,20 @@ private:
 
     static void renderDone(float, const Progress& p) {
         using namespace material;
-        if (!s_notified) { s_installed_flag = true; s_notified = true; }
+        if (!s_notified) {
+            s_installed_flag = true;
+            s_notified = true;
+            // Record a persistent "restart pending" reminder so it isn't lost if the user clicks Later.
+            if (s_app) s_app->markDaemonRestartPending();
+        }
         Type().textColored(TypeStyle::Subtitle2, Success(), TR("daemon_update_installed_ok"));
         ImGui::Spacing();
         ImGui::Text("%s %s", TR("daemon_update_version"), p.latest_tag.c_str());
         ImGui::Spacing();
+        // Lead with a warning-level headline that a restart is required, then the detail note.
+        ImGui::PushTextWrapPos(ImGui::GetCursorPosX() + ImGui::GetContentRegionAvail().x);
+        Type().textColored(TypeStyle::Subtitle2, Warning(), TR("daemon_update_restart_needed"));
+        ImGui::PopTextWrapPos();
         Type().textColored(TypeStyle::Caption, OnSurfaceMedium(), TR("daemon_update_restart_note"));
         ImGui::Spacing();
         if (s_app->isUsingEmbeddedDaemon()) {
@@ -459,6 +468,7 @@ private:
             }
             ImGui::Spacing();
             if (TactileButton(TR("daemon_update_later"), ImVec2(fullW(), 0))) s_open = false;
+            Type().textColored(TypeStyle::Caption, OnSurfaceMedium(), TR("daemon_update_later_hint"));
         } else {
             if (TactileButton(TR("close"), ImVec2(fullW(), 0))) s_open = false;
         }