Timeline: config-driven mute rules; show replies with thread-root context

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DgBEW6qAwgn2fcQbA2f4ZQ

web/src/components/Timeline.tsx

@@ -148,6 +148,12 @@ export default function Timeline() {
                   <div className="tl-kind">
                     <KindLabel event={e} />
                   </div>
+                  {e.inReplyTo && (
+                    <div className="tl-reply-ctx">
+                      ↳ <span className="actor">{e.inReplyTo.actor}</span>:{' '}
+                      {e.inReplyTo.bodyExcerpt}
+                    </div>
+                  )}
                   {e.bodyExcerpt && <div className="body">{e.bodyExcerpt}</div>}
                 </div>
               </div>