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>

CMakeLists.txt

@@ -553,7 +553,6 @@ set(APP_SOURCES
     src/ui/windows/console_selection_controller.cpp
     src/ui/windows/console_tab_helpers.cpp
     src/ui/windows/console_text_layout.cpp
-    src/ui/windows/settings_window.cpp
     src/ui/pages/settings_page.cpp
     src/ui/windows/about_dialog.cpp
     src/ui/windows/faq_dialog.cpp
@@ -704,7 +703,6 @@ set(APP_HEADERS
     src/ui/windows/console_selection_controller.h
     src/ui/windows/console_tab.h
     src/ui/windows/console_tab_helpers.h
-    src/ui/windows/settings_window.h
     src/ui/windows/about_dialog.h
     src/ui/windows/faq_dialog.h
     src/ui/windows/faq_content.h