Take the author from the article page, not the aggregator submitter

Readability already finds a byline (JSON-LD author, meta author tags,
byline markup); keep it on the article and let it replace an aggregator
entry's author, which for HN and friends is the submitter. A direct feed's
own author is still trusted over the page, and an aggregator name is only
used at all when no direct feed carried the story. The author is stored on
articles so it survives independently of the best entry.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QVPagF6jfDv78CC5Jv2wp4

src/imports.rs

@@ -165,7 +165,7 @@ fn imported_article(
         sources: Vec::new(),
         first_seen,
         url: page.final_url,
-        author: None,
+        author: extracted.author,
         feed_id: 0,
         feed_title: "Imported".into(),
         category: None,
@@ -482,6 +482,7 @@ mod tests {
         let page = Page {
             title: "A historical essay".into(),
             html: "<article><p>Useful old writing.</p><script>bad()</script><img src=\"/chart.png\"></article>".into(),
+            author: Some("Essay Writer".into()),
             final_url: "https://example.com/essays/old".into(),
         };
         let extracted = extractor.finish_readable("https://example.com/old", &page);
@@ -494,6 +495,7 @@ mod tests {
         assert_eq!(article.title, "A historical essay");
         assert_eq!(article.best_entry_id, 0);
         assert_eq!(article.feed_title, "Imported");
+        assert_eq!(article.author.as_deref(), Some("Essay Writer"));
         assert!(article.sources.is_empty());
         assert!(!article.content_html.contains("script"));
         assert_eq!(article.image_urls, ["https://example.com/chart.png"]);
@@ -502,6 +504,7 @@ mod tests {
         assert_eq!(loaded.title, "A historical essay");
         assert_eq!(loaded.best_entry_id, 0);
         assert_eq!(loaded.feed_title, "Imported");
+        assert_eq!(loaded.author.as_deref(), Some("Essay Writer"));
     }
 
     #[tokio::test]