ssb: Show/hide "Mark All Read" and the unread line more correctly.

apps/ssb/tf-news.js

@@ -14,6 +14,7 @@ class TfNewsElement extends LitElement {
 			channel: {type: String},
 			channel_unread: {type: Number},
 			recent_reactions: {type: Array},
+			hash: {type: String},
 		};
 	}
 
@@ -193,15 +194,21 @@ class TfNewsElement extends LitElement {
 		return result;
 	}
 
+	unread_allowed() {
+		return !this.hash?.startsWith('#%') && !this.hash?.startsWith('#@');
+	}
+
 	load_and_render(messages) {
 		let messages_by_id = this.process_messages(messages);
 		let final_messages = this.group_following(
 			this.finalize_messages(messages_by_id)
 		);
 		let unread_rowid = -1;
-		for (let message of final_messages) {
-			if (message.rowid >= this.channel_unread) {
-				unread_rowid = message.rowid;
+			if (this.unread_allowed()) {
+			for (let message of final_messages) {
+				if (message.rowid >= this.channel_unread) {
+					unread_rowid = message.rowid;
+				}
 			}
 		}
 		return html`