feat(theme): TitleLogo + TitleKicker display variations

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/scripts/theme/theme_keys.gd

@@ -22,6 +22,8 @@ const DARK_PANEL := &"DarkPanel"
 const HEADING := &"Heading"
 const ACCENT := &"Accent"
 const MONO := &"Mono"
+const TITLE_LOGO := &"TitleLogo"
+const TITLE_KICKER := &"TitleKicker"
 
 ## Every variation name + the base Control type it decorates. The builder and the
 ## test both iterate this so they can never drift apart.