fix: add capturing piece highlight

chess/src/main/scala/io/github/chess/viewcontroller/configuration/InterfaceConfiguration.scala

@@ -17,6 +17,7 @@ object InterfaceConfiguration:
     val LightBrownCell: Color = Color.web("#F9D19D")
     val DarkBrownCell: Color = Color.web("#D18C47")
     val SelectedCell: Color = Color.web("#D5E8D4")
+    val CapturingCell: Color = Color.web("#F5372A")
 
   /** Images of the ChessGame interface. */
   object Images:

chess/src/main/scala/io/github/chess/viewcontroller/fxcomponents/controllers/ChessBoardController.scala

@@ -6,7 +6,7 @@
  */
 package io.github.chess.viewcontroller.fxcomponents.controllers
 
-import io.github.chess.model.moves.Move
+import io.github.chess.model.moves.{CaptureMove, CastlingMove, DoubleMove, Move}
 import io.github.chess.model.pieces.Piece
 import io.github.chess.model.{ChessBoard, Position, moves}
 import io.github.chess.util.stateful.StatefulSystem
@@ -110,13 +110,21 @@ case class ChessBoardController private (
     case NoneSelected =>
     case PieceSelected(selectedCell, availableMoves) =>
       selectedCell.emphasize()
-      availableMoves.keys.foreach { this.cells.get(_).foreach(_.setMoveAvailableEffect()) }
+      availableMoves.foreach((position, move) =>
+        move match
+          case _: CaptureMove => this.cells.get(position).foreach(_.emphasizeCapture())
+          case _              => this.cells.get(position).foreach(_.setMoveAvailableEffect())
+      )
 
   override protected def exitBehavior(state: State): Unit = state match
     case NoneSelected =>
     case PieceSelected(selectedCell, availableMoves) =>
       selectedCell.deemphasize()
-      availableMoves.keys.foreach { this.cells.get(_).foreach(_.removeMoveAvailableEffect()) }
+      availableMoves.foreach((position, move) =>
+        move match
+          case _: CaptureMove => this.cells.get(position).foreach(_.deemphasize())
+          case _              => this.cells.get(position).foreach(_.removeMoveAvailableEffect())
+      )
 
 /** Companion object of [[ChessBoardController]]. */
 object ChessBoardController:

chess/src/main/scala/io/github/chess/viewcontroller/fxcomponents/pages/components/CellView.scala

@@ -71,6 +71,9 @@ case class CellView(cell: GridCell[Pane]):
   /** Add an highlighting effect to this cell. */
   def emphasize(): Unit = FXUtils.changeColor(this.cell.content, Colors.SelectedCell)
 
+  /** Add an highlighting effect of capture to this cell. */
+  def emphasizeCapture(): Unit = FXUtils.changeColor(this.cell.content, Colors.CapturingCell)
+
   /** Remove the highlighting effect from this cell. */
   def deemphasize(): Unit = FXUtils.changeColor(this.cell.content, this.defaultColor)