Stimulus controllers were reaching into Turbo.StreamElement.prototype
to call disableElement/enableElement — tight coupling to Turbo internals.
Extract both functions to app/javascript/element_helpers.js and import
from there in application.js (which still assigns them to the Turbo
prototype for server-driven Turbo Stream actions), details_controller,
and readout_unit_controller.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
