Provide tenant-scoped leader options for the Web protocol form, exclude ordinary members and retain historical names only for display. Default only to a leader of the selected region and prevent delayed requests from replacing manual choices.
Refs #1. Add backend option isolation and Web cascade regression coverage.
Use a dedicated tenant-scoped active region leader list instead of all region staff. Preserve historical labels without offering them as choices and remove the ordinary-member default during region changes.
Refs #1. Add regression coverage for tenant isolation, inactive records, deduplication, historical labels and region cascades.
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