feat: add comment notifications

internal/consumer/ingester.go

···
 		if err != nil {
 			return fmt.Errorf("failed to parse study session at-uri: %w", err)
 		}
+		subjectDid, err := subjectUri.Authority().AsDID()
+		if err != nil {
+			return fmt.Errorf("failed to identify subject did: %w", err)
+		}
 
 		body := record.Body
-		if len(body) == 0 {
+		if len(strings.TrimSpace(body)) == 0 {
 			return fmt.Errorf("invalid body: length cannot be 0")
 		}
 
···
 			tx.Rollback()
 			return fmt.Errorf("failed to upsert comment record: %w", err)
 		}
+
+		err = db.CreateNotification(tx, subjectDid.String(), did, subjectUri.String(), db.NotificationTypeComment)
+		if err != nil {
+			log.Println("failed to create notification record:", err)
+		}
+
 		return tx.Commit()
 	case models.CommitOperationDelete:
 		log.Println("deleting comment from pds request")

internal/db/db.go

···
 				subject_uri text not null,
 
 				state text not null default 'unread' check(state in ('unread', 'read')),
-				type text not null check(type in ('follow', 'reaction')),
+				type text not null check(type in ('follow', 'reaction', 'comment')),
 
 				created_at text not null default (strftime('%Y-%m-%dT%H:%M:%SZ', 'now')),
 

internal/db/notification.go

···
 const (
 	NotificationTypeFollow   NotificationType = "follow"
 	NotificationTypeReaction NotificationType = "reaction"
+	NotificationTypeComment  NotificationType = "comment"
 )
 
 type NotificationState string
···
 	RecipientDid string
 	ActorDid     string
 	SubjectRkey  string
+	SubjectDid   string
 	State        NotificationState
 	Type         NotificationType
 	CreatedAt    time.Time
···
 			return nil, fmt.Errorf("failed to parse at-uri: %w", err)
 		}
 		notification.SubjectRkey = subjectUri.RecordKey().String()
+		subjectDid, err := subjectUri.Authority().AsDID()
+		if err != nil {
+			return nil, fmt.Errorf("failed to identify subject did: %w", err)
+		}
+		notification.SubjectDid = subjectDid.String()
 
 		notifications = append(notifications, notification)
 	}

internal/server/handlers/comment.go

···
 	if !h.Config.Core.Dev {
 		event := posthog.Capture{
 			DistinctId: user.Did,
-			Event:      ph.CommentRecordDeletedEvent,
+			Event:      ph.CommentRecordCreatedEvent,
 			Properties: posthog.NewProperties().
 				Set("is_reply", newComment.ParentCommentUri != nil).
 				Set("character_count", len(newComment.Body)).

internal/server/handlers/study-session.go

···
 		return
 	}
 
+	commentFeed = utils.Filter(commentFeed, func(cwlp db.CommentWithLocalProfile) bool {
+		return !cwlp.IsDeleted
+	})
+
 	nextPage := 0
 	if len(commentFeed) > pageSize {
 		nextPage = int(page + 1)

internal/server/views/friends.templ

···
 		<div class="container mx-auto max-w-2xl px-4 py-8">
 			<div class="flex items-center justify-between mb-8">
 				<div>
-					<h1 class="text-3xl font-bold text-gray-900">Friends</h1>
-					<p class="text-gray-600 mt-1">Connect with fellow language learners</p>
+					<h1 class="text-3xl font-bold">Friends</h1>
+					<p class="mt-1">Connect with fellow language learners</p>
 				</div>
 			</div>
 			<div class="grid grid-cols-1 md:grid-cols-2 gap-6 mb-8">

internal/server/views/partials/notification.templ

···
 					<h1 class="font-semibold">New Follower</h1>
 					<p class="text-sm mt-1">
 						<a class="hover:underline" href={ templ.SafeURL("/" + params.Notification.ActorDid) }>
-							{ params.Notification.ActorDid }
+							&commat;{ params.Notification.ActorBskyHandle }
 						</a> started following you
 					</p>
 				</div>
···
 					<p class="text-sm mt-1">
 						<a class="hover:underline" href={ templ.SafeURL("/" + params.Notification.ActorDid) }>
 							&commat;{ params.Notification.ActorBskyHandle }
-						</a> reacted to your study session
+						</a> reacted to your
+						<a class="hover:underline" href={ templ.SafeURL("/" + params.Notification.SubjectDid + "/session/" + params.Notification.SubjectRkey) }>
+							study session
+						</a>
+					</p>
+				</div>
+			case db.NotificationTypeComment:
+				<div>
+					<h1 class="font-semibold">New Comment</h1>
+					<p class="text-sm mt-1">
+						<a class="hover:underline" href={ templ.SafeURL("/" + params.Notification.ActorDid) }>
+							&commat;{ params.Notification.ActorBskyHandle }
+						</a> commented on your
+						<a class="hover:underline" href={ templ.SafeURL("/" + params.Notification.SubjectDid + "/session/" + params.Notification.SubjectRkey) }>
+							study session
+						</a>
 					</p>
 				</div>
 			default: