v0.4.5 – mobile spacing and layout fixes

Fixed

• The light/dark mode toggle in the footer now actually switches the
  site's colors instead of silently doing nothing and leaving it on
  whatever the system preference was.
• Hero text now matches the original theme's width and proportions on
  mobile and desktop — it was running noticeably narrower than
  intended.
• Hero buttons now stay side-by-side at their natural size until the
  screen is narrow enough to stack, matching the original theme
  instead of stacking too early.
• Stacked hero buttons on mobile no longer stretch edge-to-edge;
  they match the original theme's proportions.
• The large translucent section headings (e.g. "A glorious title") now
  wrap and space themselves against their description the way the
  original theme does on mobile, and reveal with the same subtle
  animation on scroll.
• Photos that overlap the card above them no longer crowd the section
  edge — restored the breathing room the original theme gives them.
• Text inside image/text cards no longer runs narrower than the
  original theme on mobile.