feat(digests-ui): publication filter + 'מאמר'/source badges for bulletins

משלים את #154 בצד-לקוח:
- פילטר "מקור" בדף /digests (כל המקורות / כל יום / עו"ד על נדל"ן) — backend:
  list_digests + /api/digests מקבלים publication.
- DigestCard: תג "מאמר" ל-digest_kind='article', ו-chip מקור לפרסום שאינו 'כל יום'.

build (webpack) עובר, lint נקי. digests = hand-written types (אין api:types).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-ui/src/components/digests/digest-card.tsx

@@ -44,6 +44,11 @@ export function DigestCard({
             יומון {digest.yomon_number}
           </span>
         )}
+        {digest.publication && digest.publication !== "כל יום" && (
+          <Badge variant="outline" className="bg-rule-soft text-ink-muted text-[0.65rem]">
+            {digest.publication}
+          </Badge>
+        )}
         {digest.digest_date && <span>· {formatDate(digest.digest_date)}</span>}
         {digest.practice_area && (
           <span>· {practiceAreaLabel(digest.practice_area)}</span>
@@ -53,6 +58,11 @@ export function DigestCard({
             עדכון
           </Badge>
         )}
+        {digest.digest_kind === "article" && (
+          <Badge variant="outline" className="bg-amber-50 text-amber-700 border-amber-300 text-[0.65rem]">
+            מאמר
+          </Badge>
+        )}
         {digest.extraction_status !== "completed" && (
           <Badge variant="outline" className="bg-rule-soft text-ink-muted text-[0.65rem]">
             {digest.extraction_status === "pending" ? "ממתין לעיבוד" : digest.extraction_status}