polish(desktop): rename error-card action to 'Copy error details'

'Copy diagnostics' was dev-speak; match the familiar OS-error phrasing.
All five locales + docs updated.

apps/desktop/src/components/assistant-ui/thread/assistant-message.tsx

@@ -449,7 +449,7 @@ const StreamingMarker: FC = () => {
 // descriptor (metadata.custom.errorSurface — see agent/error_surface.py).
 // These leaves render the layer label + recovery actions. Older backends
 // never send the descriptor: the label falls back to a generic title and the
-// action row still offers Retry / Open Logs / Copy diagnostics, so nothing
+// action row still offers Retry / Open Logs / Copy error details, so nothing
 // regresses on version skew.
 
 const ErrorLayerLabel: FC = () => {

apps/desktop/src/i18n/ar.ts

@@ -2449,7 +2449,7 @@ export const ar = defineLocale({
       errorSwitchProvider: 'تبديل المزوّد',
       errorOpenLogs: 'فتح السجلات',
       errorOpenLogsFailed: 'تعذّر فتح مجلد السجلات',
-      errorCopyDiagnostics: 'نسخ التشخيصات',
+      errorCopyDiagnostics: 'نسخ تفاصيل الخطأ',
       filesChanged: count => `${count} ملفات تم تغييرها`,
       reviewChanges: 'مراجعة',
       readAloudFailed: 'فشلت القراءة بصوت عال',

apps/desktop/src/i18n/en.ts

@@ -3094,7 +3094,7 @@ export const en: Translations = {
       errorSwitchProvider: 'Switch provider',
       errorOpenLogs: 'Open logs',
       errorOpenLogsFailed: 'Could not open the logs folder',
-      errorCopyDiagnostics: 'Copy diagnostics',
+      errorCopyDiagnostics: 'Copy error details',
       filesChanged: count => (count === 1 ? '1 file changed' : `${count} files changed`),
       reviewChanges: 'Review',
       readAloudFailed: 'Read aloud failed',

apps/desktop/src/i18n/ja.ts

@@ -2746,7 +2746,7 @@ export const ja = defineLocale({
       errorSwitchProvider: 'プロバイダーを切り替え',
       errorOpenLogs: 'ログを開く',
       errorOpenLogsFailed: 'ログフォルダを開けませんでした',
-      errorCopyDiagnostics: '診断情報をコピー',
+      errorCopyDiagnostics: 'エラー詳細をコピー',
       filesChanged: count => `${count} 件のファイルを変更`,
       reviewChanges: 'レビュー',
       readAloudFailed: '読み上げに失敗しました',

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

@@ -2656,7 +2656,7 @@ export const zhHant = defineLocale({
       errorSwitchProvider: '切換服務商',
       errorOpenLogs: '開啟日誌',
       errorOpenLogsFailed: '無法開啟日誌資料夾',
-      errorCopyDiagnostics: '複製診斷資訊',
+      errorCopyDiagnostics: '複製錯誤詳細資訊',
       filesChanged: count => `${count} 個檔案已變更`,
       reviewChanges: '檢視',
       readAloudFailed: '朗讀失敗',

apps/desktop/src/i18n/zh.ts

@@ -3258,7 +3258,7 @@ export const zh: Translations = {
       errorSwitchProvider: '切换服务商',
       errorOpenLogs: '打开日志',
       errorOpenLogsFailed: '无法打开日志文件夹',
-      errorCopyDiagnostics: '复制诊断信息',
+      errorCopyDiagnostics: '复制错误详情',
       filesChanged: count => `${count} 个文件已更改`,
       reviewChanges: '查看',
       readAloudFailed: '朗读失败',

apps/desktop/src/lib/error-surface.ts

@@ -47,7 +47,7 @@ export function parseErrorSurface(value: unknown): ErrorSurface | null {
   }
 }
 
-/** Plain-text diagnostics blob for the error card's "Copy diagnostics". */
+/** Plain-text error-details blob for the error card's "Copy error details". */
 export function formatErrorDiagnostics(input: {
   appVersion?: string
   errorText: string

website/docs/user-guide/desktop.md

@@ -421,13 +421,13 @@ generic error toast. The card offers recovery actions matched to the failure:
 - **Switch provider** — jumps to Settings → Models for provider, endpoint,
   auth, and billing failures.
 - **Open logs** — opens `HERMES_HOME/logs` in your file manager.
-- **Copy diagnostics** — copies a compact plain-text summary (layer, code,
+- **Copy error details** — copies a compact plain-text summary (layer, code,
   provider/model, error message) you can paste into a bug report or Discord.
 
 The layer comes from the same error classifier the agent's retry loop uses,
 so it reflects the real failure semantics, not a guess from the message text.
 Older backends that predate the descriptor still render the card with a
-generic title and the Retry / Open logs / Copy diagnostics actions.
+generic title and the Retry / Open logs / Copy error details actions.
 
 Boot logs land in `HERMES_HOME/logs/desktop.log` (it includes backend output and recent Python tracebacks) — check it first if the app reports a boot failure. You can also tail it from the CLI: