Updates feed highlight card date display

Replaces the specific date formatting with a more user-friendly "time ago" display in the feed highlight card.

This change improves the user experience by presenting relative time information,
like "5 minutes ago" or "yesterday", instead of fixed date formats, making it easier
for users to quickly understand when the news was published.

Author: rfcbf

MacMagazine/Features/NewsLibrary/Sources/NewsLibrary/Extensions/DateExtensions.swift

@@ -89,7 +89,7 @@ public struct FeedHighlightCardView: View {
     private var dateLabel: some View {
         HStack(spacing: 6) {
             Image(systemName: "calendar")
-            Text(post.pubDate.feedDateTimeDisplay)
+            Text(post.pubDate.toTimeAgoDisplay(showTime: true))
         }
         .font(.subheadline)
         .foregroundStyle(.white.opacity(0.85))
@@ -102,7 +102,7 @@ public struct FeedHighlightCardView: View {
         if post.favorite {
             label += ", favoritado"
         }
-        label += ", publicado em \(post.pubDate.formatted(as: "dd 'de' MMMM 'de' yyyy 'às' HH:mm"))"
+        label += ", publicado em \(post.pubDate.toTimeAgoDisplay(showTime: true))"
         return label
     }