refactor(theme-studio): unify the two condition_matches clause checkers

condition_matches encoded the same four display-condition rules twice -- once
for the dict spec shape, once for the list-of-clauses shape. Normalize both to a
single {key: values} mapping and run the rules once in _condition_clauses_pass.
Verified byte-identical over 31 representative conditions (dict, list, scalar,
and malformed). The pre-existing Pyright complaints in choose_gui_light are
unrelated and untouched.

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