Make it easier to @mention the person to whom you are replying.

apps/ssb/tf-message.js

@@ -498,6 +498,7 @@ ${JSON.stringify(mention, null, 2)}</pre
 									branch=${this.message.id}
 									.drafts=${this.drafts}
 									@tf-discard=${this.discard_reply}
+									author=${this.message.author}
 								></tf-compose>
 							`
 						: html`
@@ -685,6 +686,7 @@ ${JSON.stringify(content, null, 2)}</pre
 									branch=${this.message.id}
 									.drafts=${this.drafts}
 									@tf-discard=${this.discard_reply}
+									author=${this.message.author}
 								></tf-compose>
 							`
 						: html`