Mobile polish (round 2): hero CTA vs toggle dock…

Details

- Small phones (<=480px): reserve a right-hand lane on .v2-hero-ctas and
  tuck the toggle dock tighter into the corner so it no longer sits on top
  of the LinkedIn CTA (tap-target collision at <=375px).
- Footer columns collapse to a single column at <=600px (was a 2-col grid
  that left the third 'Site' column wrapping asymmetrically).

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