[translator] Global cross-collection translation dashboard

[denis-urban]

Summary

Translation status is available per collection (get-collection-status, useCollectionTranslationStatus). There is no single view of translation activity across all configured collections. Add a CMS-wide dashboard aggregating queued / in-progress / completed translations.

Current behavior

• Status endpoints and client hooks are scoped to a single collection.
• The bulk dashboard lives in each collection's list view; there is no global overview.

Proposed change

• Add an admin view (custom nav item / dashboard) that aggregates translation jobs across all collections configured in the plugin: queued / running / completed / failed, with collection + document + target language + timestamp.
• Source the data from the queue and the existing status endpoints across the configured collection set.

Acceptance criteria

• A single admin view lists ongoing and recent translations across all configured collections.
• Each row shows: collection, document, target language, status, timestamp.
• Reflects live status (running / queued) and recent completions.

Notes

Listed under the plugin roadmap ("Global translation dashboard"). If lifecycle events are available it can subscribe to those; otherwise it aggregates the per-collection status endpoints.