fix ollama model env var mismatch

index.js

@@ -2,7 +2,7 @@ import "dotenv/config";
 import { generateDungeon } from "./dungeonGenerator.js";
 import { generateDungeonImages } from "./imageGenerator.js";
 import { generatePDF } from "./generatePDF.js";
-import { DEFAULT_OLLAMA_MODEL } from "./ollamaClient.js";
+import { OLLAMA_MODEL } from "./ollamaClient.js";
 
 // Utility to create a filesystem-safe filename from the dungeon title
 function slugify(text) {
@@ -18,7 +18,7 @@ function slugify(text) {
       throw new Error("OLLAMA_API_URL environment variable is required");
     }
     console.log("Using Ollama API URL:", process.env.OLLAMA_API_URL);
-    console.log("Using Ollama model:", DEFAULT_OLLAMA_MODEL);
+    console.log("Using Ollama model:", OLLAMA_MODEL);
 
     // Generate the dungeon data
     const dungeonData = await generateDungeon();

ollamaClient.js

@@ -1,6 +1,6 @@
 const OLLAMA_API_URL = process.env.OLLAMA_API_URL;
 const OLLAMA_API_KEY = process.env.OLLAMA_API_KEY;
-export const OLLAMA_MODEL = process.env.OLLAMA_MODEL || "gemma3n:e4b";
+export const OLLAMA_MODEL = process.env.OLLAMA_MODEL || "gemma3:4b";
 
 function cleanText(str) {
   return str