fix(tenant): resolve desktop retry article id via publish record/batch

Fall back to looking up article_id from publish_records or publish_batches
when the desktop task payload lacks article_id at the top level. Covers
payloads that only carry content_ref.{article_id,id}, publish_record_id,
or publish_batch_id, preventing spurious 40096 errors when retrying
older desktop tasks.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/tenant/app/publish_job_service_test.go

@@ -0,0 +1,63 @@
+package app
+
+import "testing"
+
+func TestResolveRetryArticleIDFromPayload(t *testing.T) {
+	t.Parallel()
+
+	cases := []struct {
+		name    string
+		payload map[string]any
+		wantID  int64
+		wantOK  bool
+	}{
+		{
+			name: "top level article id",
+			payload: map[string]any{
+				"article_id": 78,
+			},
+			wantID: 78,
+			wantOK: true,
+		},
+		{
+			name: "nested content ref article id",
+			payload: map[string]any{
+				"content_ref": map[string]any{
+					"article_id": 79,
+				},
+			},
+			wantID: 79,
+			wantOK: true,
+		},
+		{
+			name: "nested content ref generic id",
+			payload: map[string]any{
+				"content_ref": map[string]any{
+					"id": 80,
+				},
+			},
+			wantID: 80,
+			wantOK: true,
+		},
+		{
+			name: "missing article id",
+			payload: map[string]any{
+				"publish_record_id": 999,
+			},
+			wantID: 0,
+			wantOK: false,
+		},
+	}
+
+	for _, tc := range cases {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			gotID, gotOK := resolveRetryArticleIDFromPayload(tc.payload)
+			if gotID != tc.wantID || gotOK != tc.wantOK {
+				t.Fatalf("resolveRetryArticleIDFromPayload() = (%d, %v), want (%d, %v)", gotID, gotOK, tc.wantID, tc.wantOK)
+			}
+		})
+	}
+}