Unify juice stream piece UX with osu! control point pieces

- Use same hover state
- Use shift-right click for quick delete rather than shift-left click

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/SelectionEditablePath.cs

@@ -52,7 +52,7 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
             if (index == -1 || VertexStates[index].IsFixed)
                 return false;
 
-            if (e.Button == MouseButton.Left && e.ShiftPressed)
+            if (e.Button == MouseButton.Right && e.ShiftPressed)
             {
                 changeHandler?.BeginChange();
                 RemoveVertex(index);

osu.Game.Rulesets.Catch/Edit/Blueprints/Components/VertexPiece.cs

@@ -5,6 +5,7 @@ using osu.Framework.Allocation;
 using osu.Framework.Extensions.Color4Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Input.Events;
 using osu.Game.Graphics;
 using osuTK;
 
@@ -12,6 +13,8 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
 {
     public partial class VertexPiece : Circle
     {
+        private VertexState state = new VertexState();
+
         [Resolved]
         private OsuColour osuColour { get; set; } = null!;
 
@@ -24,7 +27,32 @@ namespace osu.Game.Rulesets.Catch.Edit.Blueprints.Components
 
         public void UpdateFrom(VertexState state)
         {
-            Colour = state.IsSelected ? osuColour.Yellow.Lighten(1) : osuColour.Yellow;
+            this.state = state;
+            updateMarkerDisplay();
+        }
+
+        protected override bool OnHover(HoverEvent e)
+        {
+            updateMarkerDisplay();
+            return false;
+        }
+
+        protected override void OnHoverLost(HoverLostEvent e)
+        {
+            updateMarkerDisplay();
+        }
+
+        /// <summary>
+        /// Updates the state of the circular control point marker.
+        /// </summary>
+        private void updateMarkerDisplay()
+        {
+            var colour = osuColour.Yellow;
+
+            if (IsHovered || state.IsSelected)
+                colour = colour.Lighten(1);
+
+            Colour = colour;
             Alpha = state.IsFixed ? 0.5f : 1;
         }
     }