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ae50ba35 - [ty] Fix semantic token classification for generic class members in annotations (#23811)

[ty] Fix semantic token classification for generic class members in annotations (#23811) ## Summary This PR fixes semantic highlighting for dotted generic class names used in annotation positions, like `os.PathLike` and `os.PathLike[str]`. Annotated assignments now visit their annotation through the annotation-specific path. Closes https://github.com/astral-sh/ty/issues/2989.