v0.6.2: order sources by most recent message (recency)

- Sidebar sources ordered by Max(created_at) desc instead of alphabetically;
  "All sources" stays pinned at top (rendered separately).
- Live updates move a source to the top when it gets a new message, so the
  recency order holds without a reload.

152 tests pass; JS re-validated with node --check.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

artifacts/views.py

@@ -19,7 +19,7 @@ from django.contrib.auth import views as auth_views
 from django.contrib.auth.decorators import login_required
 from django.contrib.auth.models import User
 from django.db import OperationalError, transaction
-from django.db.models import Count, Q, Sum
+from django.db.models import Count, Max, Q, Sum
 from django.http import FileResponse, Http404, HttpResponse, HttpResponseForbidden, JsonResponse
 from django.shortcuts import get_object_or_404, redirect, render
 from django.template.defaultfilters import date as date_filter, slugify
@@ -586,10 +586,12 @@ def feed(request):
     source_scoped = apply_feed_filters(
         live, "", selected_label, selected_kind, title_query
     )
+    # Sources ordered by most recent message first (Telegram-style); "All
+    # sources" is rendered separately and stays pinned at the top.
     source_counts = (
         source_scoped.values("source")
-        .annotate(count=Count("id", filter=Q(read_at__isnull=True)))
-        .order_by("source")
+        .annotate(count=Count("id", filter=Q(read_at__isnull=True)), latest=Max("created_at"))
+        .order_by("-latest")
     )
     keep_count = live.filter(is_kept=True).count()
     trash_count = Artifact.objects.filter(owner=request.user, deleted_at__isnull=False).count()