* feat(landing): replace features section with GSAP scroll-driven showcase
Add LandingFeaturesScroll, a pinned scroll section that walks through four
product pillars with interactive mockups: agent harness, worktree isolation,
review routing, and the local daemon.
On desktop, the mockup starts centered and shifts right as copy fades in,
then snaps through each feature with crossfade transitions. Mobile falls
back to a stacked layout with scaled mockups.
Swap LandingFeatures for LandingFeaturesScroll on the landing page and add
gsap as a dependency for ScrollTrigger animations.
* fix(landing): polish spacing and accent styling across sections
Tighten vertical rhythm on the landing page and align a hero CTA with the
theme accent color.
- Increase agents bar bottom padding and drop the trailing period in its subtitle
- changed bg color for the hero mockup "Spawn Orchestrator" button
- Add bottom padding to the social proof description
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