Unknown type 'str' also suggests 's8'

name: str reports Unknown type 'str' - did you mean 's8'? with the help "str was removed; use string". The "did you mean" comes from suggest_similar_name (closest by edit distance) and contradicts the help.

Fix: in validate_type (and the constant-type error), skip suggest_similar_name when text_type_hint returns a hint. Small enough to ride along with the next core change rather than run its own pin cascade.