Migrate CategoryOptions dropdown to KMultiSelect

[Prashant-thakur77]

Summary

Migrates the CategoryOptions dropdown from Vuetify's VAutocomplete to KDS
KMultiSelect, as part of moving Studio off Vuetify. This is the Category field in a
resource's Edit details panel.

The expanded mode used by the bulk edit modal is intentionally left on
VAutocomplete it needs an inline mode and externally controlled indeterminate values
from KMultiSelect, which don't exist yet.

Partof: learningequality/kolibri-design-system#1259

Notable points:

• Two intentional display changes: a parent with one selected child now shows
  indeterminate instead of checked (it was never in the saved data), so clicking it now
  adds just that parent instead of clearing the whole branch.
• Search is unchanged (label matching only), matching the old field.
• onKMultiSelectInput converts KMultiSelect's flat array back to
  { categoryId: [nodeIds] } and preserves partially applied categories. Partials can't
  occur today (single node only): this is forward-compatibility for the expanded-mode
  migration.
• Tests rewritten with Vue Testing Library, covering this component's bridging logic
  without duplicating KDS's own KMultiSelect coverage.

References

• KDS component PR: Implement the KMultiSelect wrapper and Dropdown components for KMultiSelect kolibri-design-system#1296

Screencast.From.2026-08-17.02-11-04.mp4

Expanded Mode:

Screencast.From.2026-08-17.02-20-34.mp4

Reviewer guidance

All tests are covered and there are no regressions.

AI usage

I used Claude to generate this discription and done changes as needed

[learning-equality-bot]

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[Prashant-thakur77]

@LianaHarris360 I’ve created the PR for the hierarchical use of KMultiSelect in CategoryOptions
Please take a look when you have time:)