Administrators often need exact model identifiers while editing account whitelists. Add a dedicated copy action without changing model selection or upstream sync behavior.
Constraint: Keep the contribution frontend-only and avoid model routing or persistence changes
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep copy and selection as separate actions
Tested: focused Vitest, account component regression tests, frontend typecheck, lint, and production build
Not-tested: Authenticated browser screenshot
Related: Wei-Shaw/sub2api#2151
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