feat/调整tts音色，调整封面图prompt，修复对话页输入框显示逻辑，待验证封面图生成功能

app-expo/src/features/memoir/hooks.ts

@@ -69,6 +69,19 @@ export function useDeleteChapter() {
   });
 }
 
+export function useCheckCoverGeneration() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: () => memoirApi.checkCoverGeneration(),
+    onSuccess: (data) => {
+      if (data.triggered.length > 0) {
+        queryClient.invalidateQueries({ queryKey: memoirKeys.chapters() });
+      }
+    },
+  });
+}
+
 // ─── Memoir state ───
 
 export function useMemoirState() {