fix(qso): every by-ids statement is chunked — 168k QSOs is a selection too

One placeholder per id in a single IN (…) hits SQLite's bound-variable cap:
bulk field set died at 168 000 QSOs with 'too many SQL variables' (10 000
passed). One chunker now serves bulk set (text/int/extra/frequency), the
delete, the post-upload markers and the export-selection iterator — the last
collecting and sorting once at the end so its chronological contract holds
across chunks. 500 ids a statement keeps every backend far from any limit.

changelog.json

@@ -1,4 +1,14 @@
 [
+  {
+    "version": "0.27.2",
+    "date": "",
+    "en": [
+      "Bulk operations work on any size of selection — setting a field, fixing frequencies, deleting, marking uploads and exporting the selection all failed with “too many SQL variables” past a few tens of thousands of QSOs. Statements are now issued in slices."
+    ],
+    "fr": [
+      "Les opérations groupées fonctionnent quelle que soit la taille de la sélection — définir un champ, corriger des fréquences, supprimer, marquer les uploads et exporter la sélection échouaient avec « too many SQL variables » au-delà de quelques dizaines de milliers de QSO. Les requêtes sont désormais émises par tranches."
+    ]
+  },
   {
     "version": "0.27.1",
     "date": "",