initFirstRunExperience no longer writes the launcher card's classes,
attributes and text, wires its listeners or removes it: it presents the
card's visibility, busy state, status line, copy and scroll fade to the
gev-first-run store and connects the controls the welcome view's choices,
DISMISS and "Don't show this again" call. A refused save hands the tick
back to the view to revert. The launcher still reads the rendered card for
its hit test, keyboard trap, focus and overflow measurement.
The owner-chosen copy moves to src/firstRunCopy.js, shared by both. The
source-text tests give way to component tests, and the first-run mutation
QA follows the new code (67/67 caught).
