Spawn a `ReplayTableauDimLayer` UI node (100% × 100%, 50% opacity black)
at z=54 (Z_REPLAY_OVERLAY − 1) whenever a replay starts. The dim layer
darkens the entire card world so the replay chrome (banner at z=55,
move-log panel at z=55) reads clearly against the scene without
obscuring card positions — matching the mockup's "Game Peek Band at
50% opacity" spec. Bevy's UI/world compositor means no changes to
card_plugin are needed: UI nodes always render above world-space sprites
regardless of Transform.z values.
The dim layer carries no Interaction component (purely visual; pointer
events pass through). Despawned alongside the banner and move-log panel
in `react_to_state_change` when the replay ends.
Adds Z_REPLAY_DIM (= 54) and TABLEAU_DIM_ALPHA (= 0.5) constants plus
two new tests: lifecycle (spawn/despawn mirrors floating chip pattern)
and z-ordering invariant (Z_REPLAY_DIM < Z_REPLAY_OVERLAY pinned).
1275 tests pass / 0 failing. Closes the last major B-2 sub-piece.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
funman300
da3e5423dc