claude:design: drop the inter-section hairlines on protocol pages (mobile)

On viewports below md the .single-project-page-* panels swapped their
full card border for a single `border-top` hairline as a section
divider. Removes the hairline so consecutive sections (description,
local delegate, official delegate, statistics) flow into each other
on mobile, relying on the existing 24px top padding alone for
breathing room. The InfoComponent cards (col-lg-3 / col-lg-9) still
keep their full chrome — they're explicitly re-bordered further down
the same media query.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: kuco23

src/pages/protocols/protocols.scss

@@ -51,16 +51,14 @@
 }
 
 @include t.down(md) {
-    // Strip outer chrome — but replace it with a top hairline + 24px of
-    // breathing room so consecutive sections (description, local delegate,
-    // official delegate, statistics) still read as discrete chunks rather
-    // than one continuous wall of text.
+    // Strip outer chrome entirely on small viewports. Vertical padding
+    // gives consecutive sections breathing room without the dividing
+    // hairlines.
     .single-project-page-left,
     .single-project-page-right {
         margin: 0;
         padding: 24px 0 0;
         border: none;
-        border-top: 1px solid rgba(255, 255, 255, 0.08);
         background: transparent;
     }