fix: adjust opacity for model selector based on readonly state (#12472)

web/app/components/datasets/create/step-two/index.tsx

             <div className={cn('system-md-semibold mb-1', datasetId && 'flex justify-between items-center')}>{t('datasetSettings.form.embeddingModel')}</div>
             <ModelSelector
               readonly={!!datasetId}
+              triggerClassName={datasetId ? 'opacity-50' : ''}
               defaultModel={embeddingModel}
               modelList={embeddingModelList}
               onSelect={(model: DefaultModel) => {

web/app/components/header/account-setting/model-provider-page/model-selector/model-trigger.tsx

       className={classNames(
         'group flex items-center px-2 h-8 rounded-lg bg-components-input-bg-normal',
         !readonly && 'hover:bg-components-input-bg-hover cursor-pointer',
-        !!readonly && 'opacity-50',
         className,
         open && '!bg-components-input-bg-hover',
         model.status !== ModelStatusEnum.active && '!bg-[#FFFAEB]',