feat(first-run): render the mission launcher from a store

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).

scripts/format-scope.json

@@ -1157,5 +1157,8 @@
   "src/hudReadouts.js",
   "src/ui/stores/hud.js",
   "src/ui/views/intelHudView.test.mjs",
-  "src/testSupport/hudReadouts.mjs"
+  "src/testSupport/hudReadouts.mjs",
+  "src/ui/stores/firstRun.js",
+  "src/firstRunLauncherView.test.mjs",
+  "src/firstRunCopy.js"
 ]