Updating HUD, Gold Config, and finishing off Play flow for 9player map.

Assets/_Project/Scripts/Editor/Gameplay/WaveGoldEntryDrawer.cs

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+// Assets/_Project/Scripts/Editor/Gameplay/WaveGoldEntryDrawer.cs
+using UnityEditor;
+using UnityEngine;
+using TD.Gameplay;
+
+namespace TD.Editor.Gameplay
+{
+    /// <summary>
+    /// Custom property drawer for <see cref="WaveGoldEntry"/>. Renders the standard fields
+    /// followed by a read-only "Preview Total" line computed from the entry's values, so
+    /// designers can see at a glance how much a single player could earn from a wave.
+    /// </summary>
+    /// <remarks>
+    /// The preview includes the kill-reward portion only when the entry's <c>Wave</c>
+    /// reference is assigned (it's needed to count enemies in that wave). When unset, the
+    /// preview shows just <c>CompletionBonus + NoLeaksBonus</c> and labels itself so the
+    /// designer knows to drop a WaveDefinition in for a complete number.
+    /// </remarks>
+    [CustomPropertyDrawer(typeof(WaveGoldEntry))]
+    public class WaveGoldEntryDrawer : PropertyDrawer
+    {
+        private const float PreviewLineExtraHeight = 4f;
+
+        public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
+        {
+            // Sum the children + one extra line for the preview label. We render children
+            // ourselves rather than using EditorGUI.PropertyField default since we want a
+            // foldout with our custom preview tacked onto the end.
+            if (!property.isExpanded) return EditorGUIUtility.singleLineHeight;
+
+            float h = EditorGUIUtility.singleLineHeight; // foldout
+            h += SpacedLineHeight() * 4;                  // Wave + GoldPerEnemy + Completion + NoLeaks
+            h += SpacedLineHeight() + PreviewLineExtraHeight; // preview label
+            return h;
+        }
+
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+        {
+            // Foldout header.
+            Rect headerRect = new Rect(position.x, position.y, position.width,
+                                       EditorGUIUtility.singleLineHeight);
+            property.isExpanded = EditorGUI.Foldout(headerRect, property.isExpanded, label,
+                                                   toggleOnLabelClick: true);
+            if (!property.isExpanded) return;
+
+            float y = position.y + SpacedLineHeight();
+            float indent = 14f;
+            Rect Row()
+            {
+                Rect r = new Rect(position.x + indent, y, position.width - indent,
+                                  EditorGUIUtility.singleLineHeight);
+                y += SpacedLineHeight();
+                return r;
+            }
+
+            // Standard property fields.
+            var waveProp        = property.FindPropertyRelative("Wave");
+            var perEnemyProp    = property.FindPropertyRelative("GoldPerEnemy");
+            var completionProp  = property.FindPropertyRelative("CompletionBonus");
+            var noLeaksProp     = property.FindPropertyRelative("NoLeaksBonus");
+
+            EditorGUI.PropertyField(Row(), waveProp);
+            EditorGUI.PropertyField(Row(), perEnemyProp);
+            EditorGUI.PropertyField(Row(), completionProp);
+            EditorGUI.PropertyField(Row(), noLeaksProp);
+
+            // Compute the preview total. We instantiate the same logic as the runtime
+            // property — read the serialized values, count enemies in the optional Wave,
+            // sum it all up. Done inline (rather than calling WaveGoldEntry.PreviewTotalGold
+            // directly) because SerializedProperty edits aren't applied to the target object
+            // until ApplyModifiedProperties runs at the end of the frame, so reading the
+            // backing class instance here would show stale data while the user is typing.
+            int perEnemy   = perEnemyProp.intValue;
+            int completion = completionProp.intValue;
+            int noLeaks    = noLeaksProp.intValue;
+            var waveAsset  = waveProp.objectReferenceValue as WaveDefinition;
+
+            int enemyCount = 0;
+            if (waveAsset != null && waveAsset.Entries != null)
+            {
+                foreach (var e in waveAsset.Entries)
+                {
+                    if (e.EnemyType != null && e.Count > 0)
+                        enemyCount += e.Count;
+                }
+            }
+
+            int total = perEnemy * enemyCount + completion + noLeaks;
+
+            // Preview line. Slightly dimmed style, italic, non-editable. Includes a
+            // breakdown so the designer can see where the number came from.
+            y += PreviewLineExtraHeight;
+            Rect previewRect = new Rect(position.x + indent, y, position.width - indent,
+                                         EditorGUIUtility.singleLineHeight);
+
+            string breakdown = waveAsset != null
+                ? $"Preview Total: {total} g   ({perEnemy} × {enemyCount} enemies " +
+                  $"+ {completion} completion + {noLeaks} no-leak)"
+                : $"Preview Total: {completion + noLeaks} g   (bonuses only — assign Wave " +
+                  $"to include kill rewards)";
+
+            var prevStyle = new GUIStyle(EditorStyles.miniLabel) { fontStyle = FontStyle.Italic };
+            using (new EditorGUI.DisabledScope(true))
+            {
+                EditorGUI.LabelField(previewRect, breakdown, prevStyle);
+            }
+        }
+
+        private static float SpacedLineHeight()
+            => EditorGUIUtility.singleLineHeight + EditorGUIUtility.standardVerticalSpacing;
+    }
+}

Assets/_Project/Scripts/Editor/Gameplay/WaveGoldEntryDrawer.cs.meta

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+fileFormatVersion: 2
+guid: cc17000144b098340a210921594babca