style(credits): bullet markers on contributor cards (#287)

Plain lines blur together once a card has more than a handful of
contributions; a simple accent-colored • in front of each row makes the
list scannable without changing the tone.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/styles/components.css

@@ -3247,6 +3247,20 @@
   font-size: 12px;
   color: var(--text-secondary);
   line-height: 1.7;
+  list-style: none;
+}
+.contributor-card-list li {
+  position: relative;
+  padding-left: 14px;
+}
+.contributor-card-list li::before {
+  content: '•';
+  position: absolute;
+  left: 0;
+  top: 0;
+  color: var(--accent);
+  font-weight: 700;
+  line-height: 1.7;
 }
 
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