Accept single-target pet powers on pets

validateTarget tested MASK_MOB before MASK_PET, and summoned pets carry
both, so every single-target PET power (pet heals and buffs such as
Repair Golem, Dark Lord's Favor, Strengthen Beast, Vashteera's Favor)
was rejected on any pet. Pets are now tested first and accept PET or
MOBILE powers, matching the client, where Mobile covers every ArcMobile
and Pet is left to the server (0x49E440). Non-pet mobs are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/gameManager/PowersManager.java

@@ -2261,14 +2261,14 @@ public enum PowersManager {
             String outmsg = "Invalid Target";
             ChatManager.chatSystemInfo(pc, outmsg);
             return false; // can't target player, stop here
-        } // target is mob
+        } // target is pet; pets also carry MASK_MOB, so test them first. A pet is still a Mobile (client 0x49E440)
+        else if ((target.getObjectTypeMask() & MBServerStatics.MASK_PET) != 0)
+            return pb.targetPet() || pb.targetMob();
+
+            // target is mob
         else if ((target.getObjectTypeMask() & MBServerStatics.MASK_MOB) != 0)
             return pb.targetMob();
 
-            // target is pet
-        else if ((target.getObjectTypeMask() & MBServerStatics.MASK_PET) != 0)
-            return pb.targetPet();
-
             // target is Building
         else if ((target.getObjectTypeMask() & MBServerStatics.MASK_BUILDING) != 0)
             return pb.targetBuilding();