Split custom world generation into staged lightweight batches

src/services/llmClient.ts

@@ -18,6 +18,13 @@ export class LlmConnectivityError extends Error {
   }
 }
 
+export class LlmTimeoutError extends LlmConnectivityError {
+  constructor(message: string) {
+    super(message);
+    this.name = 'LlmTimeoutError';
+  }
+}
+
 export function resolveTimeoutMs(rawValue: string | undefined, fallback: number) {
   const parsed = Number(rawValue);
   return Number.isFinite(parsed) && parsed > 0 ? Math.round(parsed) : fallback;
@@ -26,7 +33,7 @@ export function resolveTimeoutMs(rawValue: string | undefined, fallback: number)
 export const REQUEST_TIMEOUT_MS = resolveTimeoutMs(ENV.VITE_LLM_REQUEST_TIMEOUT_MS, 15000);
 export const CUSTOM_WORLD_REQUEST_TIMEOUT_MS = resolveTimeoutMs(
   ENV.VITE_LLM_CUSTOM_WORLD_TIMEOUT_MS,
-  Math.max(REQUEST_TIMEOUT_MS, 45000),
+  Math.max(REQUEST_TIMEOUT_MS, 120000),
 );
 
 function logLlmDebug(title: string, payload: unknown) {
@@ -39,7 +46,7 @@ function logLlmDebug(title: string, payload: unknown) {
 
 function normalizeLlmError(error: unknown): never {
   if (error instanceof DOMException && error.name === 'AbortError') {
-    throw new LlmConnectivityError('The LLM request timed out. Please check the network or endpoint.');
+    throw new LlmTimeoutError('The LLM request timed out. Please check the network or endpoint.');
   }
 
   if (error instanceof TypeError) {
@@ -53,6 +60,10 @@ export function isLlmConnectivityError(error: unknown): error is LlmConnectivity
   return error instanceof LlmConnectivityError;
 }
 
+export function isLlmTimeoutError(error: unknown): error is LlmTimeoutError {
+  return error instanceof LlmTimeoutError;
+}
+
 async function requestMessageContent(
   systemPrompt: string,
   userPrompt: string,