Revert #644 (overlay redraw) — incomplete, regresses ROI labels

[jackgallant]

Reverts #644. The surf "update" -> schedule() redraw fixes the overlay not redrawing on toggle, but it's incomplete: ROI label text textures are generated asynchronously in Labels.update (svg.toDataURL -> set_tex) and set_tex doesn't schedule a redraw. #644 forces a redraw the instant the overlay rebakes — usually before the label texture has loaded — so the label shader samples an empty texture and renders black squares that persist (nothing redraws again). Observed on the static make_static viewers (e.g. chen-2024) on load.

The generation guard (#643) is correct and stays. A complete fix must also redraw when each label texture finishes loading (touches the Labels class) and needs in-browser verification before landing — deferred.

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request removes the 'update' event listener registration and its associated comment from the surface initialization in cortex/webgl/resources/js/mriview.js. There are no review comments, and I have no feedback to provide.