[P3] crash-card-actions-below-fold: the crash card's buttons can sit below the fold with Esc suppressed

Deferred from /bmad-code-review of the pinned dialog footer (PR #664, v1.104.0). Edge Case Hunter finding.

The pinned-footer rule added in #664 is scoped to .modal-box > .modal-actions, so the crash card (src/ui/crashScreen.ts) is not covered by it. On a short or landscape phone its Reload / Download buttons can fall below the fold, and the crash card deliberately suppresses Esc, so a player who cannot reach the buttons has no way out of it.

This is the same failure #664 fixed for dialogs, on the one surface where the fallback is worst: it is already the screen the player lands on when something has gone wrong.

Fix when picked up: give the crash card the same sticky treatment. It is not a .modal-box, so it needs its own rule rather than an extension of the dialog selector. Add a capture at a short viewport, following the pattern of the shots #664 added.

/bmad-code-review.

Start in src/ui/crashScreen.ts and compare the crash card with the pinned-footer treatment from PR #664. Apply the crash card’s own sticky rule, then check it at a short or landscape phone viewport. Done means the Reload and Download buttons remain reachable despite Esc being suppressed, with a capture following the shots from #664.