i18n(desktop): translate backend update apply status messages

Two independent reviewers flagged that applyBackendUpdate's in-progress and
error messages were inline English while the rest of the update overlay is
i18n'd. Move them into updates.applyStatus (preparing/pulling/restarting/
notAvailable/failed/noReturn) across en, ja, zh, zh-hant + types.

apps/desktop/src/i18n/en.ts

@@ -1258,7 +1258,15 @@ export const en: Translations = {
     applyingClose: 'Hermes will close to apply the update.',
     errorTitle: 'Update didn’t finish',
     errorBody: 'No worries — nothing was lost. You can try again now.',
-    notNow: 'Not now'
+    notNow: 'Not now',
+    applyStatus: {
+      preparing: 'Updating backend…',
+      pulling: 'Backend updating…',
+      restarting: 'Backend restarting to load the update…',
+      notAvailable: 'Update not available for this backend.',
+      failed: 'Backend update failed.',
+      noReturn: 'Backend didn’t come back online. The update may not have completed — check the backend host.'
+    }
   },
 
   install: {

apps/desktop/src/i18n/ja.ts

@@ -1400,7 +1400,15 @@ export const ja = defineLocale({
     applyingClose: 'Hermes は更新を適用するために閉じます。',
     errorTitle: '更新が完了しませんでした',
     errorBody: 'ご安心ください。何も失われていません。今すぐ再試行できます。',
-    notNow: '今は後で'
+    notNow: '今は後で',
+    applyStatus: {
+      preparing: 'バックエンドを更新しています…',
+      pulling: 'バックエンドを更新中…',
+      restarting: 'バックエンドが更新を読み込むため再起動しています…',
+      notAvailable: 'このバックエンドでは更新を利用できません。',
+      failed: 'バックエンドの更新に失敗しました。',
+      noReturn: 'バックエンドがオンラインに戻りませんでした。更新が完了していない可能性があります。バックエンドホストを確認してください。'
+    }
   },
 
   install: {

apps/desktop/src/i18n/types.ts

@@ -959,6 +959,14 @@ export interface Translations {
     errorTitle: string
     errorBody: string
     notNow: string
+    applyStatus: {
+      preparing: string
+      pulling: string
+      restarting: string
+      notAvailable: string
+      failed: string
+      noReturn: string
+    }
   }
 
   install: {

apps/desktop/src/i18n/zh-hant.ts

@@ -1365,7 +1365,15 @@ export const zhHant = defineLocale({
     applyingClose: 'Hermes 將關閉以套用更新。',
     errorTitle: '更新未完成',
     errorBody: '沒有資料遺失。您可以現在重試。',
-    notNow: '暫不'
+    notNow: '暫不',
+    applyStatus: {
+      preparing: '正在更新後端…',
+      pulling: '後端更新中…',
+      restarting: '後端正在重新啟動以載入更新…',
+      notAvailable: '此後端無法更新。',
+      failed: '後端更新失敗。',
+      noReturn: '後端未恢復連線。更新可能未完成——請檢查後端主機。'
+    }
   },
 
   install: {

apps/desktop/src/i18n/zh.ts

@@ -1445,7 +1445,15 @@ export const zh: Translations = {
     applyingClose: 'Hermes 将关闭以应用更新。',
     errorTitle: '更新未完成',
     errorBody: '没有数据丢失。你可以现在重试。',
-    notNow: '暂不'
+    notNow: '暂不',
+    applyStatus: {
+      preparing: '正在更新后端…',
+      pulling: '后端更新中…',
+      restarting: '后端正在重启以加载更新…',
+      notAvailable: '此后端无法更新。',
+      failed: '后端更新失败。',
+      noReturn: '后端未恢复在线。更新可能未完成——请检查后端主机。'
+    }
   },
 
   install: {

apps/desktop/src/store/updates.ts

@@ -336,7 +336,7 @@ function finishBackendApply(returned: boolean): DesktopUpdateApplyResult {
     applying: false,
     stage: 'error',
     error: 'apply-failed',
-    message: 'Backend didn’t come back online. The update may not have completed — check the backend host.'
+    message: translateNow('updates.applyStatus.noReturn')
   })
 
   return { ok: false, error: 'apply-failed', message: 'Backend did not come back online.' }
@@ -344,20 +344,20 @@ function finishBackendApply(returned: boolean): DesktopUpdateApplyResult {
 
 export async function applyBackendUpdate(): Promise<DesktopUpdateApplyResult> {
   dismissNotification(UPDATE_TOAST_ID)
-  $backendUpdateApply.set({ ...IDLE, applying: true, stage: 'prepare', message: 'Updating backend…' })
+  $backendUpdateApply.set({ ...IDLE, applying: true, stage: 'prepare', message: translateNow('updates.applyStatus.preparing') })
 
   try {
     const started = await updateHermes()
 
     if (!started.ok) {
-      const message = (started as { message?: string }).message || 'Update not available for this backend.'
+      const message = (started as { message?: string }).message || translateNow('updates.applyStatus.notAvailable')
       const command = (started as { update_command?: string }).update_command || 'hermes update'
       $backendUpdateApply.set({ ...IDLE, applying: false, stage: 'manual', message, command })
 
       return { ok: false, error: 'manual', manual: true, message, command }
     }
 
-    $backendUpdateApply.set({ ...IDLE, applying: true, stage: 'pull', message: 'Backend updating…' })
+    $backendUpdateApply.set({ ...IDLE, applying: true, stage: 'pull', message: translateNow('updates.applyStatus.pulling') })
 
     let last: Awaited<ReturnType<typeof getActionStatus>> | null = null
     for (let attempt = 0; attempt < 30; attempt += 1) {
@@ -370,7 +370,7 @@ export async function applyBackendUpdate(): Promise<DesktopUpdateApplyResult> {
           ...$backendUpdateApply.get(),
           applying: true,
           stage: 'restart',
-          message: 'Backend restarting to load the update…'
+          message: translateNow('updates.applyStatus.restarting')
         })
 
         return finishBackendApply(await waitForBackendReturn())
@@ -383,7 +383,7 @@ export async function applyBackendUpdate(): Promise<DesktopUpdateApplyResult> {
 
     const ok = !!last && (last.exit_code ?? 1) === 0
     if (ok) {
-      $backendUpdateApply.set({ ...$backendUpdateApply.get(), applying: true, stage: 'restart', message: 'Backend restarting to load the update…' })
+      $backendUpdateApply.set({ ...$backendUpdateApply.get(), applying: true, stage: 'restart', message: translateNow('updates.applyStatus.restarting') })
 
       return finishBackendApply(await waitForBackendReturn())
     }
@@ -393,7 +393,7 @@ export async function applyBackendUpdate(): Promise<DesktopUpdateApplyResult> {
       applying: false,
       stage: 'error',
       error: 'apply-failed',
-      message: 'Backend update failed.'
+      message: translateNow('updates.applyStatus.failed')
     })
 
     return { ok: false, error: 'apply-failed', message: 'Backend update failed.' }