Persist custom world asset configs in runtime snapshots

src/components/CustomWorldGenerationView.tsx

@@ -48,6 +48,14 @@ function getProgressPercentage(progress: CustomWorldGenerationProgress | null) {
   return Math.max(0, Math.min(100, progress?.overallProgress ?? 0));
 }
 
+function buildFallbackRenderKey(
+  value: string | null | undefined,
+  fallback: string,
+) {
+  const normalizedValue = value?.trim();
+  return normalizedValue ? normalizedValue : fallback;
+}
+
 export function CustomWorldGenerationView({
   settingText,
   anchorEntries = [],
@@ -171,9 +179,9 @@ export function CustomWorldGenerationView({
           </div>
 
           <div className="mt-4 space-y-2 xl:min-h-0 xl:flex-1 xl:overflow-y-auto xl:pr-1">
-            {steps.map((step) => (
+            {steps.map((step, index) => (
               <div
-                key={step.id}
+                key={buildFallbackRenderKey(step.id, `progress-step-${index}`)}
                 className={`rounded-2xl border px-4 py-3 transition-colors ${
                   step.status === 'completed'
                     ? 'border-emerald-400/16 bg-emerald-500/8'
@@ -269,9 +277,12 @@ export function CustomWorldGenerationView({
           </div>
           {hasStructuredAnchors ? (
             <div className="grid grid-cols-1 gap-3 sm:grid-cols-2">
-              {anchorEntries.map((entry) => (
+              {anchorEntries.map((entry, index) => (
                 <div
-                  key={entry.id}
+                  key={buildFallbackRenderKey(
+                    entry.id,
+                    `anchor-entry-${index}`,
+                  )}
                   className="rounded-2xl border border-white/8 bg-black/22 px-4 py-4"
                 >
                   <div className="text-[11px] font-bold tracking-[0.18em] text-zinc-500">