feat: parse <author> from From header in RSS items

Parse the From header into name + email parts so the feed library
renders proper RFC 2822 format (email (Name)) in <author> elements.
Also passes feedId to the generator so item links can point to the
upcoming /entries/:feedId/:receivedAt route.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

src/routes/rss.ts

@@ -62,7 +62,7 @@ export async function handle(c: Context): Promise<Response> {
 
     // Generate the RSS feed XML
     const baseUrl = `https://${env.DOMAIN}`;
-    const rssXml = generateRssFeed(feedConfig, emailsData, baseUrl);
+    const rssXml = generateRssFeed(feedConfig, emailsData, baseUrl, feedId);
 
     // Return the RSS feed with appropriate content type
     return new Response(rssXml, {