more robust json parsing

src/lib/components/MonsterGenerator/MonsterGenerator.svelte

@@ -355,8 +355,27 @@ Assistant: \`\`\`json`;
       }
       
       try {
+        // Remove any trailing text after the JSON object
+        const jsonMatch = cleanJson.match(/^\s*\{[\s\S]*?\}\s*/);
+        if (jsonMatch) {
+          cleanJson = jsonMatch[0];
+        }
+        
         const parsedStats = JSON.parse(cleanJson.trim());
         
+        // Remove any extra fields not in our schema
+        const allowedFields = ['name', 'description', 'rarity', 'HP', 'defence', 'attack', 'speed',
+          'specialPassiveTraitDescription', 'attackActionName', 'attackActionDescription',
+          'buffActionName', 'buffActionDescription', 'debuffActionName', 'debuffActionDescription',
+          'specialActionName', 'specialActionDescription', 'boostActionName', 'boostActionDescription',
+          'disparageActionName', 'disparageActionDescription'];
+        
+        for (const key in parsedStats) {
+          if (!allowedFields.includes(key)) {
+            delete parsedStats[key];
+          }
+        }
+        
         // Ensure numeric fields are actually numbers
         const numericFields = ['rarity', 'HP', 'defence', 'attack', 'speed'];