Snake_case methods on proxies the binder returns #20

What

m.fill_max_width(), m.z_index(1.5), m.padding_from_baseline(16) on a Modifier (or any receiver proxy) that Kotlin handed back.

Why

These are attributes of the binder's own proxy class, which resolves Kotlin names only. The module-level rule (#8) cannot reach them. python-multiplatform #17 adds python_multiplatform.binding.add_member_resolver(fn), which caches resolved aliases in the resolver registry rather than on the binder's class, so dir() and code that uses androidx.* directly still see Kotlin names only.

Done when

pythonx registers its naming rule as a member resolver, and the 4 tests in tests/test_chain.py that skip with "python-multiplatform #17" run and pass. A test fails with the resolver unregistered.