修复: 队列发送失败回填不丢消息+池权重revert+lang解析DRY+注释变量名修正

src/components/settings/ProviderPanel.vue

@@ -318,6 +318,7 @@ async function onPoolToggle(p: AiProviderConfig, enabled: boolean) {
 function onPoolWeightChange(p: AiProviderConfig, raw: number) {
   // NaN 兜底(清空输入):回退 50,防 IPC 传 NaN 后端 serde u32 失败
   const clamped = Math.min(100, Math.max(0, Number.isFinite(raw) ? Math.trunc(raw) : 50))
+  const prev = p.weight
   p.weight = clamped
   if (_poolTimer) clearTimeout(_poolTimer)
   _poolTimer = setTimeout(async () => {
@@ -325,6 +326,7 @@ function onPoolWeightChange(p: AiProviderConfig, raw: number) {
       await aiApi.updateProviderPool(p.id, p.enabled !== false, clamped)
       emit('toast', t('settings.toastPoolUpdateOk'), 'info')
     } catch (e) {
+      p.weight = prev  // revert
       console.error(t('settings.toastPoolUpdateFail', { msg: errMsg(e) }), e)
       emit('toast', t('settings.toastPoolUpdateFail', { msg: errMsg(e) }), 'error')
     }