draft options working; spells won't cast though

Assets/_Project/Scripts/Gameplay/BuilderSpells/FireballSpellDefinition.cs

@@ -0,0 +1,47 @@
+// Assets/_Project/Scripts/Gameplay/BuilderSpells/FireballSpellDefinition.cs
+using UnityEngine;
+using TD.Core;
+
+namespace TD.Gameplay.BuilderSpells
+{
+    /// <summary>
+    /// Builder spell #1 — drop a fireball on a point, dealing direct damage to whatever's
+    /// there plus splash damage to nearby enemies.
+    /// </summary>
+    /// <remarks>
+    /// <see cref="BuilderSpellDefinition.TargetType"/> is <see cref="SpellTargetType.PointTarget"/>
+    /// — the cast controller shows only a fixed-size reticle, even though
+    /// <see cref="BuilderSpellDefinition.Radius"/> is still used internally here as the splash
+    /// radius (0 = no splash, direct hit only).
+    /// </remarks>
+    [CreateAssetMenu(fileName = "FireballSpell", menuName = "TD/Builder Spells/Fireball")]
+    public class FireballSpellDefinition : BuilderSpellDefinition
+    {
+        public override BuilderSpellKind Kind => BuilderSpellKind.Fireball;
+
+        [Header("Fireball")]
+        [Tooltip("Damage dealt to every enemy within Radius of the target point.")]
+        [Min(0f)]
+        public float Damage = 50f;
+
+        public override bool ServerCast(ulong clientId, Vector3 targetPoint)
+        {
+            PlayerSlot owner = PlayerMatchState.SlotForClient(clientId);
+
+            int count = Physics.OverlapSphereNonAlloc(
+                targetPoint, Mathf.Max(Radius, 0.01f), s_overlapBuffer, enemyLayerMask);
+
+            bool hitAny = false;
+            for (int i = 0; i < count; i++)
+            {
+                var enemyHealth = s_overlapBuffer[i].GetComponent<EnemyHealth>();
+                if (enemyHealth == null || enemyHealth.IsDead) continue;
+
+                enemyHealth.TakeDamage(Damage, DamageType.Fire, owner);
+                hitAny = true;
+            }
+
+            return hitAny;
+        }
+    }
+}