Tighten Now Playing header layout

[paulpv]

Summary

The Now Playing header now shows shorter titles, leaving awkward whitespace between the track number, artist, and title. Adjust the layout so the area looks balanced and uses space efficiently.

Proposed work

• Audit the current Now Playing markup and styles to locate spacing/margin rules that assumed longer filenames.
• Revise the layout (flex/grid tweaks, gap adjustments, text alignment) so shorter titles still feel cohesive with the rest of the UI.
• Verify the design scales for long titles and narrow viewports without reintroducing truncation issues.
• Keep the tooltip/raw filename behavior intact and ensure accessibility remains solid.
• Document visual changes and updated manual testing notes in README.md, including before/after screenshots if possible.