Show desktop update check feedback (#1808)

* fix(desktop): show app update check feedback

Manual desktop app update checks now leave visible status feedback even when the shared update state is pending or available. Updater check and preparation errors are carried through the existing result path so the settings row and callout can show the failure instead of only logging it.

* fix(desktop): make update retries perform fresh checks

Manual retries now clear runtime errors emitted by a failed check so the next click calls the updater again. Background checks also skip while a visible manual check is active, and last-checked update copy uses complete localized strings.

* fix(desktop): punctuate update check timestamp copy

* fix(desktop): share runtime update errors

* fix(desktop): preserve update preparation errors

* fix(desktop): settle update check review races

* fix(desktop): settle quiet update check errors

* fix(desktop): handle overlapping update checks

* fix(desktop): preserve preparation errors during checks

packages/app/src/i18n/resources/zh-CN.ts

@@ -927,8 +927,11 @@ export const zhCN: TranslationResources = {
         upToDate: "App 已是最新版本。",
         upToDateWithLastChecked: "已是最新版本。上次检查时间：{{time}}。",
         pending: "更新准备好后会通知你。",
+        pendingWithLastChecked: "更新准备好后会通知你。上次检查时间：{{time}}。",
         availableWithVersion: "更新已就绪：{{version}}",
+        availableWithVersionAndLastChecked: "更新已就绪：{{version}}。上次检查时间：{{time}}。",
         available: "有 app 更新可安装。",
+        availableWithLastChecked: "有 app 更新可安装。上次检查时间：{{time}}。",
         installed: "App 更新已安装。需要重启。",
         failed: "App 更新失败。",
         idle: "尚未检查更新状态。",