#approve-tx-error and #approve-sign-error reserved 20px, but their border and padding took 10px of it, so a one-line error grew them to 26px and pushed the Confirm/Sign buttons down 6px. They now reserve 30px, the same 4px to spare over one line that the other password error containers have. A new end-to-end test shows each of the six password error containers on its own screen at the popup viewport, empty and then with an error, and fails if one changes height or the element below it moves. Model: opus-5-5