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/utils/combat.mjs

@@ -206,17 +206,21 @@ export async function handleAttackBoosted(msg) {
         if (!reroll) continue
         updatedDefenseRoll = reroll.options?.rollTotal || reroll.total || oldDefenseRoll
         let newD30message = reroll.options?.D30message || null
-        const mulliganContent = await foundry.applications.handlebars.renderTemplate("systems/fvtt-lethal-fantasy/templates/chat/reaction-message.hbs", {
-          type: "mulligan",
-          actorName: defenderName,
-          side: "defense",
-          oldRoll: oldDefenseRoll,
-          newRoll: updatedDefenseRoll,
-          diceResults: reroll.options?.diceResults || [],
-          D30result: reroll.options?.D30result,
-          D30message: newD30message
-        })
-        await ChatMessage.create({content: mulliganContent, speaker: ChatMessage.getSpeaker({actor: defender})})
+        try {
+          const mulliganContent = await foundry.applications.handlebars.renderTemplate("systems/fvtt-lethal-fantasy/templates/chat/reaction-message.hbs", {
+            type: "mulligan",
+            actorName: defenderName,
+            side: "defense",
+            oldRoll: oldDefenseRoll,
+            newRoll: updatedDefenseRoll,
+            diceResults: reroll.options?.diceResults || [],
+            D30result: reroll.options?.D30result,
+            D30message: newD30message
+          })
+          await ChatMessage.create({content: mulliganContent, speaker: ChatMessage.getSpeaker({actor: defender})})
+        } catch(e) {
+          console.error("Mulligan message creation failed (non-fatal):", e)
+        }
         // Process new D30 bonus dice from the reroll
         if (newD30message) {
           defenseD30message = newD30message