Sync live edit selector models

[chadwickmeyer]

Summary

Improves Stratus selector behavior for live-edit module relationships.

• preserves inactive selected module entries in live-edit module selectors
• sorts null priorities after numeric priorities for consistent selected-list ordering
• emits selector collection and item-change events so the Sitetheory live preview can update immediately
• avoids redundant selector data changes during status-only live-edit updates
• tracks local-only selector display fields outside the saved parent model baseline

Validation

• npm run build
• git diff --check