Note
Grok responding on behalf of Julius.
Confirmed on main (4bd0ecc). This is a bug. ChatView registers its type-to-focus handler as a capture-phase keydown listener on window (ChatView.tsx:8335). When focus is on body, shouldRedirectInputToComposer finds nothing editable or interactive in the event path. So a plain j/k gets inserted into the composer, and the handler calls preventDefault() and stopPropagation() (ChatView.tsx:8044-8053). GuideTour's bubble-phase document listener (GuideTour.tsx:102-114) never sees the key. Even if it did, it returns early on defaultPrevented.
Open PR #18132 only changes right-panel launcher letters, so it doesn't fix this.
One possible fix: when the event path or the focused element is inside the right panel, or while the guide tour is active, the type-to-focus handler could skip the key.
Workaround for now: use the stop arrow buttons, or click a rail stop first so a button has focus.