fix: make landing page footer reachable past scroll-snap (#1118)

scroll-snap-type: y mandatory (docs/index.html:28) forces the viewport to
always rest on a snap point. The footer is far shorter than a viewport, so
scrolling down past the last min-height:100vh section snaps back to that
section's start and the footer can never settle in view. Switch the snap
type to 'proximity' so sections still snap when the user is near them but
the footer (and any sub-viewport tail) is freely reachable.

Fixes arcahyadi#8

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Hayk Arzumanyan

docs/index.html

@@ -25,7 +25,7 @@
     --radius: 8px;
   }
   * { box-sizing: border-box; }
-  html { scroll-behavior: smooth; scroll-snap-type: y mandatory; scroll-padding-top: 60px; }
+  html { scroll-behavior: smooth; scroll-snap-type: y proximity; scroll-padding-top: 60px; }
   /* Each section is a full-viewport "page" with its content centered, so only
      one shows at a time and the snap is obvious. */
   .hero, section {