Audit date-based queries for compatibility with deprecated published metadata

[rubenvdlinde]

Background

OpenRegister's deprecate-published-metadata change has removed published / depublished columns from object storage. RBAC $now rules now drive publication visibility (see opencatalogi migration issue).

Scope for Softwarecatalogus

• Audit any UI or backend code that reads @self.published / @self.depublished on register objects.
• Audit any date-based queries that order or filter on _published / _depublished magic-table columns — these no longer exist.
• Replace with @self.created / @self.updated ordering or with RBAC $now-based filtering as appropriate.
• Delete obsolete frontend artifacts: src/modals/object/MassPublishObjects.vue, src/modals/object/MassDepublishObjects.vue, src/components/PublishedIcon.vue.

Validation

• Smoke-test softwarecatalog list views, detail views, and any "published" filter affordance.
• Verify the test suite still passes.

References

• OpenRegister deprecate-published-metadata change (closed): https://github.com/ConductionNL/openregister/blob/feat/openspec-batch-impl-2026-05-02/openspec/changes/deprecate-published-metadata/tasks.md