The voice input mode has been updated from a fixed "Hold Space to record" trigger to a configurable push-to-talk system. The voice mode setting is now voice:pushToTalk and supports space or modifier key combinations like meta+k. The prompt text changed from "Hold Space to record" to a generic "hold [key] to record" that reflects the configured key.
Evidence
Voice mode config (search for "voice:pushToTalk")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agree
Added voice:pushToTalk keybinding to make the voice activation key rebindable in keybindings.json (default: space) — modifier+letter combos…