style(brand): unify orange to #FA7850 + yellow token; fix tablet header gap

- Brand orange is now the official #FA7850 everywhere: folded the stray
  oranges (#F2762E, #E8833A, #ff6b2c) into it and kept a single darker shade
  (#E85D2A) for gradient depth + button hover. Added the official brand
  --yellow (#FFE16E) token.
- Tablet header gap (769-1024px): the fixed header shrinks 80->60px there but
  first-section paddings kept their 80px clearance; pull the first section up
  by the 20px delta in that range only (phones untouched). Verified on
  interior pages and the full-bleed homepage hero — gap now matches desktop,
  no overlap.
- Re-stamped cache-bust (v=f95de694).

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

css/pages/_support.css

@@ -16,7 +16,7 @@
 .sup-eyebrow {
     display: inline-flex; align-items: center; gap: 8px;
     font-weight: 700; font-size: 14px; letter-spacing: 0.06em;
-    text-transform: uppercase; color: #E8833A;
+    text-transform: uppercase; color: #FA7850;
 }
 .sup-hero h1 { font-size: 44px; line-height: 1.12; color: #101828; margin: 0; font-weight: 700; }
 .sup-lead { font-size: 19px; line-height: 30px; color: #475467; margin: 0; max-width: 680px; }