Twin of the children fix: builders annotated ``attributes`` as
``list[HTMLAttribute] | None``, and ``list`` is invariant, so passing the
``list[tuple[str, str]]`` a caller naturally writes was a type error.
Add ``Attributes = Sequence[HTMLAttribute]`` (covariant) and use it for the
``attributes`` parameter of every builder. Locals that get appended/concatenated
stay a concrete ``list[HTMLAttribute]`` via the new ``as_attributes()``
normaliser, mirroring ``as_children()`` — builders call it once up front so
``attributes + [...]`` keeps working on a real list.
Pyright on common/components drops 45 → 42; the remaining errors are all
pre-existing and unrelated (django-stubs model access, the ``mark_safe``
``_Wrapped`` return type, and the separate ``FilterSelect`` options-list
invariance). Full suite green (443).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
lukas
544da26a9d
