Refactor SEO and JSON-LD handling; improve layout and styles

- Introduced `compactJsonLd` utility to filter out falsy values from JSON-LD arrays.
- Updated various pages to utilize `compactJsonLd` for cleaner JSON-LD handling.
- Refactored music playlist configuration in Header component.
- Enhanced BaseLayout with inline script for JSON-LD and removed unnecessary media attributes from stylesheets.
- Improved error handling in category and tag pages by simplifying response logic.
- Added new styles for home hero section and sidebar components to enhance UI.
- Adjusted layout components for better responsiveness and visual consistency.

frontend/src/components/Header.astro

@@ -17,7 +17,8 @@ const {
 const { locale, t, buildLocaleUrl } = getI18n(Astro);
 const aiEnabled = Boolean(Astro.props.siteSettings?.ai?.enabled);
 const musicEnabled = Astro.props.siteSettings?.musicEnabled ?? true;
-const musicPlaylist = (musicEnabled ? Astro.props.siteSettings?.musicPlaylist : []).filter(
+const configuredMusicPlaylist = Astro.props.siteSettings?.musicPlaylist ?? [];
+const musicPlaylist = (musicEnabled ? configuredMusicPlaylist : []).filter(
   (item) => item?.title?.trim() && item?.url?.trim()
 );
 const musicPlaylistPayload = JSON.stringify(musicPlaylist);