fix: wrap mulligan message creation in try/catch to prevent handler abort

Even with the partial correctly registered, a template rendering failure
should not abort the entire reroll handler. Without try/catch, the
exception propagates out of the do-while loop and prevents combat result
creation. The reroll value was applied but nothing else happened.

module/hooks/chat-reaction.mjs

@@ -551,16 +551,20 @@ Hooks.on("createChatMessage", async (message) => {
           canRerollDefense = false
           if (!reroll) continue
           defenseRoll = reroll.options?.rollTotal || reroll.total || oldDefenseRoll
-          await createReactionMessage(defender, {
-            type: "mulligan",
-            actorName: defenderName,
-            side: "defense",
-            oldRoll: oldDefenseRoll,
-            newRoll: defenseRoll,
-            diceResults: reroll.options?.diceResults || [],
-            D30result: reroll.options?.D30result,
-            D30message: reroll.options?.D30message
-          })
+          try {
+            await createReactionMessage(defender, {
+              type: "mulligan",
+              actorName: defenderName,
+              side: "defense",
+              oldRoll: oldDefenseRoll,
+              newRoll: defenseRoll,
+              diceResults: reroll.options?.diceResults || [],
+              D30result: reroll.options?.D30result,
+              D30message: reroll.options?.D30message
+            })
+          } catch(e) {
+            console.error("Mulligan message creation failed (non-fatal):", e)
+          }
           // Apply new D30 result on the restart
           if (reroll.options?.D30message) {
             defenseD30message = reroll.options.D30message
@@ -753,16 +757,20 @@ Hooks.on("createChatMessage", async (message) => {
           canRerollAttack = false
           if (!reroll) continue
           attackRollFinal = reroll.options?.rollTotal || reroll.total || oldAttackRoll
-          await createReactionMessage(attacker, {
-            type: "mulligan",
-            actorName: attackerName,
-            side: "attack",
-            oldRoll: oldAttackRoll,
-            newRoll: attackRollFinal,
-            diceResults: reroll.options?.diceResults || [],
-            D30result: reroll.options?.D30result,
-            D30message: reroll.options?.D30message
-          })
+          try {
+            await createReactionMessage(attacker, {
+              type: "mulligan",
+              actorName: attackerName,
+              side: "attack",
+              oldRoll: oldAttackRoll,
+              newRoll: attackRollFinal,
+              diceResults: reroll.options?.diceResults || [],
+              D30result: reroll.options?.D30result,
+              D30message: reroll.options?.D30message
+            })
+          } catch(e) {
+            console.error("Mulligan message creation failed (non-fatal):", e)
+          }
           // Apply new D30 result on the restart
           if (reroll.options?.D30message) {
             attackD30message = reroll.options.D30message