DashboardLayout: add min-w-0 to flex child (prevents overflow), use
max-lg:ml-0 for responsive specificity, absolute-positioned player at
bottom of content area.
Header: bg-background/80 → bg-transparent with backdrop-blur-md for a
seamless Spotify-like header that blends with the page content below.
Co-authored-by: Cursor <cursoragent@cursor.com>
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