fix(renderer): avoid non-iterable provider data

src/lib/host-api.ts

@@ -89,15 +89,33 @@ function parseUnifiedProxyResponse<T>(
   }
 
   const data: HostApiProxyData = response.data ?? {};
+  const status = data.status ?? 200;
+  const ok = typeof data.ok === 'boolean'
+    ? data.ok
+    : status >= 200 && status < 300;
+
   trackUiEvent('hostapi.fetch', {
     path,
     method,
     source: 'ipc-proxy',
     durationMs: Date.now() - startedAt,
-    status: data.status ?? 200,
+    status,
   });
 
-  if (data.status === 204) return undefined as T;
+  if (!ok) {
+    const json = data.json;
+    const message = (json && typeof json === 'object' && 'error' in (json as Record<string, unknown>))
+      ? String((json as Record<string, unknown>).error)
+      : (typeof json === 'string' && json.trim() ? json : (data.text || `HTTP ${status}`));
+    throw normalizeAppError(new Error(message), {
+      source: 'ipc-proxy',
+      path,
+      method,
+      status,
+    });
+  }
+
+  if (status === 204) return undefined as T;
   if (data.json !== undefined) return data.json as T;
   return data.text as T;
 }

src/pages/Chat/ChatToolbar.tsx

@@ -77,13 +77,13 @@ export function ChatToolbar() {
 
   const providerVendorById = useMemo(() => {
     const map = new Map<string, ProviderVendorInfo>();
-    for (const v of providerVendors) map.set(v.id, v);
+    for (const v of (Array.isArray(providerVendors) ? providerVendors : [])) map.set(v.id, v);
     return map;
   }, [providerVendors]);
 
   const providerStatusById = useMemo(() => {
     const map = new Map<string, ProviderWithKeyInfo>();
-    for (const s of providerStatuses) map.set(s.id, s);
+    for (const s of (Array.isArray(providerStatuses) ? providerStatuses : [])) map.set(s.id, s);
     return map;
   }, [providerStatuses]);
 

src/stores/providers.ts

@@ -88,9 +88,9 @@ export const useProviderStore = create<ProviderState>((set, get) => ({
       const snapshot = await fetchProviderSnapshot();
       
       set({ 
-        statuses: snapshot.statuses ?? [],
+        statuses: Array.isArray(snapshot.statuses) ? snapshot.statuses : [],
-        accounts: snapshot.accounts ?? [],
+        accounts: Array.isArray(snapshot.accounts) ? snapshot.accounts : [],
-        vendors: snapshot.vendors ?? [],
+        vendors: Array.isArray(snapshot.vendors) ? snapshot.vendors : [],
         defaultAccountId: snapshot.defaultAccountId ?? null,
         loading: false 
       });