fix(show-coverage): white show-title on dark card (was inheriting dark navy)

/show-coverage cards have bg-[#0b0f17] but the H3 had no color, so it
inherited text-[#0F172A] from the page wrapper — dark-on-dark, unreadable.
Forced text-white to match the header's main-menu text color.

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

src/app/show-coverage/page.tsx

@@ -126,7 +126,7 @@ function EventCard({ e }: { e: Row }) {
         className="block p-5 rounded border border-[#DCE6F2] hover:border-[var(--color-text-info,#60a5fa)] bg-[#0b0f17] transition-colors"
       >
         <div className="flex items-start justify-between gap-3">
-          <h3 className="font-serif text-xl font-semibold">{e.name}</h3>
+          <h3 className="font-serif text-xl font-semibold text-white">{e.name}</h3>
           <span className={pillStatus(e.status)}>{e.status}</span>
         </div>
         <div className="text-sm text-[#9ca3af] mt-1">