fix: don't show replies to muted users in timelines

Closes #337

packages/backend/src/core/FanoutTimelineEndpointService.ts

@@ -122,6 +122,7 @@ export class FanoutTimelineEndpointService {
 				filter = (note) => {
 					if (isUserRelated(note, userIdsWhoBlockingMe, ps.ignoreAuthorFromBlock)) return false;
 					if (isUserRelated(note, userIdsWhoMeMuting, ps.ignoreAuthorFromMute)) return false;
+					if (note.mentions.some(mention => userIdsWhoMeMuting.has(mention))) return false;
 					if (isPureRenote(note) && isUserRelated(note, userIdsWhoMeMutingRenotes, ps.ignoreAuthorFromMute)) return false;
 					if (isInstanceMuted(note, userMutedInstances)) return false;