Downloads: surface the macOS universal build

We ship a universal macOS zip (Apple Silicon + Intel), but the site
read as macOS being source-only. Add a macOS download row and lead the
meta + hero microcopy with the prebuilt binary; keep build-from-source
as the alternative.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

index.html

@@ -63,9 +63,7 @@
           </div>
         </div>
         <p class="micro">
-          Linux · Windows · Android today — macOS
-          <a href="https://github.com/2ro/goblin#build" rel="noopener">builds from source</a>.
-          Apache-2.0, sha256 checksums on every build.
+          Linux · macOS · Windows · Android. Apache-2.0, sha256 checksums on every build.
         </p>
       </div>
 
@@ -199,6 +197,11 @@
               <span class="name">Windows <span class="file">x86_64 · zip</span></span>
               <span class="arrow">↓</span>
             </a>
+            <a href="https://github.com/2ro/goblin/releases/latest">
+              <svg viewBox="0 0 24 24"><path d="M12 7.6c-1.2-1-2.9-1-4.1 0-1.7 1.3-2.1 4.1-1 6.7.7 1.8 2 3.9 3.4 3.9.7 0 1-.4 1.7-.4s1 .4 1.7.4c1.4 0 2.7-2.1 3.4-3.9 1.1-2.6.7-5.4-1-6.7-1.2-1-2.9-1-4.1 0z"/><path d="M12 7.6c0-1.6 1.1-3.1 2.7-3.4"/></svg>
+              <span class="name">macOS <span class="file">universal · zip</span></span>
+              <span class="arrow">↓</span>
+            </a>
             <a href="https://github.com/2ro/goblin/releases/latest">
               <svg viewBox="0 0 24 24"><path d="M7 8.5C7 6 9.2 4 12 4s5 2 5 4.5M7 8.5h10M7 8.5v7a2 2 0 0 0 2 2h6a2 2 0 0 0 2-2v-7M9 4 8 2.5M15 4l1-1.5M9.5 19.5V22M14.5 19.5V22"/></svg>
               <span class="name">Android <span class="file">armv7 + arm64 · apk</span></span>
@@ -211,7 +214,8 @@
             </a>
           </div>
           <p class="dl-meta">
-            macOS: <a href="https://github.com/2ro/goblin#build" rel="noopener">build from source</a> —
+            macOS build is universal — Apple Silicon and Intel in one. Prefer to compile?
+            <a href="https://github.com/2ro/goblin#build" rel="noopener">Build from source</a> —
             clone with <code>--recursive</code>, then <code>cargo build --release</code>.
           </p>
         </div>