TEST-ONLY: apply buildPerioGrid to a hand-built container, without
requiring a live initOdontogram() (there is no full-DOM mount harness for
the tooth panel — see sp14-ortho-ui.test.ts's header comment). Lets a test
verify the real grid-building DOM shape (ids/data-attributes/types) that
production wireControls() builds once at init. Not part of the public API.
TEST-ONLY: apply buildPerioGrid to a hand-built container, without requiring a live initOdontogram() (there is no full-DOM mount harness for the tooth panel — see sp14-ortho-ui.test.ts's header comment). Lets a test verify the real grid-building DOM shape (ids/data-attributes/types) that production wireControls() builds once at init. Not part of the public API.