Coerces a raw accounts value (the UI sends a string) into the importer's
string[] | 'all' shape: the 'all' sentinel, or a comma/space-separated list
split into trimmed account numbers. Empty input falls back to 'all'.
Parameters
value: unknown
Raw accounts value from the UI (string or already-typed).
Coerces a raw
accountsvalue (the UI sends a string) into the importer'sstring[] | 'all'shape: the 'all' sentinel, or a comma/space-separated list split into trimmed account numbers. Empty input falls back to 'all'.