First of the editing ops to reach the wx frontend. Extract the business logic
(validate the kind, tag the part, apply the connector model) into
core/app/edit.{hpp,cpp}: app::set_connector_type(Part*, kind) -> {ok, error,
materialised}, refusing without mutation when the kind is invalid for the part.
Both TUI call sites now use it: the `set-connector-type` command and the
interactive settype screen (de-dup) — output unchanged. The wx GUI gains an
Edit ▸ Set connector type… menu: a reusable PickPart() (module → part choice
dialogs) + a kind prompt, then the same core op, logged and reflected in the
model tree. Prune the now-dead pin_model/transform_vpx includes from
commands.cpp.
Unit-tested by tests/test_edit.cpp (free-form kind tags; invalid kind refused
without mutation; null part). tui + wx build clean; 376 core assertions green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
François
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