DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.
The notification dismiss prompt now accepts Space in addition to Enter and Escape, changing from "Press Enter or Escape to dismiss" to "Press Space, Enter, or Escape to dismiss".
Evidence
Dismiss prompt text (search for "Press Space, Enter, or Escape to dismiss")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.