When handle_double_tap recognises a double-tap and fires MoveRequestEvent,
the moved card(s) are immediately tinted STATE_SUCCESS (lime #acc267) with
a 0.35 s HintHighlight so the player sees visual confirmation before the
card animation begins.
- Priority 1 (single top card): flashes that card only.
- Priority 2 (whole face-up stack): flashes every card in drag.cards.
Reuses the existing tick_hint_highlight cleanup path (restores sprite
to WHITE when timer expires) so no new system or component is needed.
The flash duration (0.35 s) slightly outlasts a typical card animation
(~0.3 s), giving the tint a brief moment at the destination before clearing.
Marks P1 "Double-tap auto-move visible feedback" as closed in
PLAYABILITY_TODO (hardware trigger-verification still manual).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
funman300
9fb59c7d47