Fix toolchain insertion into toolchain

It broke with recent changes somehow

added in-progress label

oh boy this is a messy bug.

Basically, I didn't understand some of what React does behind-the-scenes for synchronization/state update optimization. There are two state updates happening too quickly together so the first one is getting discarded.

This is a pretty big revelation on my part but I don't have enough time to update things to be more sync-safe. For now it should be enough to combine those two updates to one, since the wait for user input is more than enough to prevent state merging here.

closed via commit 3b0e3af2