style: lighter inline code, black system bars for the installed app

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/lib/theme.ts

@@ -157,8 +157,8 @@ function applyToDocument(themeId: ThemeId, customCss: string | null): void {
   syncThemeColorMeta();
 }
 
-// The status bar (theme-color) starts blue for the splash screen; once the app runs it follows the
-// active theme's background so it blends with the header.
+// The status bar (theme-color) starts black (like the Android navigation bar of the installed app,
+// which only takes the manifest colour); once the app runs it follows the theme's background.
 function syncThemeColorMeta(): void {
   const meta = document.querySelector('meta[name="theme-color"]');
   if (!meta || typeof requestAnimationFrame === 'undefined') return;