[Game] Animate life counter manipulation (#7100)

* Add animations toggles for the life counter and battlefield

Per-effect toggles plus Enable/Disable-all buttons: a life-counter
flash on loss and a crimson battlefield shimmer on damage.


Took 24 seconds

* Animate life changes with a counter flash and battlefield shimmer

- Life loss/gain pulses the player life counter with a brief flash
- The battlefield table zone shimmers crimson on damage
- Respects the per-effect animation toggles

Both effects drive their decay from GameScene's shared animation timer
through the IAnimatedItem interface (QElapsedTimer based), instead of
owning per-item QTimers.

Took 8 minutes

* Revert unintentional cherry picks

Took 2 minutes

* Lambda to re-use path calculation.

Took 8 minutes

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/game_graphics/zones/table_zone.cpp

@@ -8,6 +8,7 @@
 #include "../board/arrow_item.h"
 #include "../board/card_drag_item.h"
 #include "../board/card_item.h"
+#include "../game_scene.h"
 #include "../z_values.h"
 
 #include <QGraphicsScene>
@@ -47,6 +48,31 @@ void TableZone::updateBg()
     update();
 }
 
+void TableZone::triggerDamageShimmer()
+{
+    if (!SettingsCache::instance().userInterface().getBattlefieldFlashEnabled()) {
+        damageShimmerAlpha = 0.0;
+        return;
+    }
+
+    damageShimmerAlpha = 1.0;
+    shimmerClock.start();
+    if (scene()) {
+        static_cast<GameScene *>(scene())->registerAnimationItem(this);
+    }
+}
+
+bool TableZone::animationEvent()
+{
+    damageShimmerAlpha = 1.0 - shimmerClock.elapsed() / shimmerDurationMs;
+    if (damageShimmerAlpha <= 0.0) {
+        damageShimmerAlpha = 0.0;
+        return false;
+    }
+    update();
+    return true;
+}
+
 QRectF TableZone::boundingRect() const
 {
     return QRectF(0, 0, width, height);
@@ -77,6 +103,13 @@ void TableZone::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*opti
         painter->fillRect(boundingRect(), FADE_MASK);
     }
 
+    // Decaying crimson wash from taking damage.
+    if (damageShimmerAlpha > 0.0) {
+        QColor shimmerColor(239, 68, 68);
+        shimmerColor.setAlphaF(0.22 * damageShimmerAlpha);
+        painter->fillRect(boundingRect(), shimmerColor);
+    }
+
     paintLandDivider(painter);
 }