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* fix(web): translate Design Files / live artifact refresh strings instead of hardcoding English When the app language was set to Chinese, the Design Files refresh flow showed Chinese for the surrounding chrome but kept English for every label and message originating in describeRefreshStatus, describeEventPhase, and the refresh-event timeline body of LiveArtifactRefreshHistoryPanel. Same-screen mixed-language UX, the exact symptom reported in #1254. Root cause: those three sites bypassed i18n entirely. describeRefreshStatus returned hardcoded English label + description strings for the running / succeeded / failed / idle / never statuses; describeEventPhase returned hardcoded Started / Succeeded / Failed labels; the timeline body inlined "Refresh started…", "<n> source(s) updated", and "Refresh failed." string literals; and the empty-timeline copy ("No refresh activity yet in this session. Trigger Refresh to record a timeline…") was hardcoded too. Fix: thread the existing TranslateFn through both helpers, swap every hardcoded string for a t() lookup, and pull the empty-timeline copy and the failure-fallback through the same path. Added 13 new keys under liveArtifact.refresh.* — statusRunning, the five *Description keys, three event-phase labels (eventStarted/Succeeded/Failed), eventStartedDetail, sourcesUpdatedOne/Many with an {n} placeholder, and timelineEmpty. Status labels for succeeded / failed / ready / never already had keys (statusSucceeded / statusFailed / statusReady / statusNever) so those are reused unchanged. Locales: full Chinese translations added to zh-CN.ts (the locale directly named in the issue). The other 16 locales pick up English fallbacks through their existing ...en spread, so the locale-key alignment test stays green; native translations for those locales can land via the usual locale-team passes without re-touching the source code. * fix(web): cover the rest of the refresh panel under i18n + add a zh-CN render test Lefarcen's review on #1254 / PR #1300 surfaced that the first pass only translated three helpers (describeRefreshStatus, describeEventPhase, session timeline body) and left the rest of the panel in English. Under a Chinese UI the panel still mixed languages, which was exactly the regression the issue was filed for. This commit threads t() through every user-visible refresh-panel string the user would see in the Chinese flow: - Hero block: "Last refreshed" label + "Never" empty state. - Created / Last updated facts + their "Unknown" empty label. - Persisted refresh history header, hint, empty-state copy. - Persisted timeline status badge: succeeded / running / failed / cancelled / skipped now resolve through describePersistedStatus, which uses an exhaustive switch off LiveArtifactRefreshLogEntry's status union so a future contract addition trips tsc. - Session activity header, hint. - Document source header, hint, Type / Tool / Connector field labels. - Advanced debug metadata summary + note line. - "just now" relative-time fallback in the persisted timeline. 22 new i18n keys total (23 with the new heroLastRefreshedNever distinct from statusNever); zh-CN strings authored alongside the English source, every other locale picks them up via its existing ...en spread and the locale-key alignment test stays green. Intentionally untranslated surfaces: raw daemon payloads inside the <details> debug panel (event.step / refreshId / error.message and the JSON.stringify dump), since those are agent / connector identifiers and stack-trace style strings, not localised copy. The debug summary heading itself is translated; if the debug section should be hidden in localised primary flows, that is a separate UX call worth its own issue. Test coverage: new render test wraps LiveArtifactRefreshHistoryPanel in I18nProvider initial="zh-CN" and pins the Chinese rendering of every translated label, plus negative assertions that the formerly hardcoded English literals are NOT present in the markup. With the no-provider fallback returning English, the existing static-markup tests can't observe the regression this PR is meant to fix; the zh-CN render test is the only one that would have caught the original gap and will catch the next one. Validated: pnpm guard, pnpm --filter @open-design/web typecheck, locales.test.ts (5/5), FileViewer.test.tsx (69/69, +1 new zh-CN test), full web suite (92 files, 841 tests). * fix(web): route formatRelativeTime through Intl.RelativeTimeFormat so units localise Lefarcen's second pass on PR #1300 caught the remaining hardcoded English path: formatRelativeTime() still emitted units like `5s ago` and `45m ago`, so Chinese users would see those strings inside the otherwise-translated refresh panel. The function now takes the active locale + TranslateFn and routes through Intl.RelativeTimeFormat with style: 'narrow', numeric: 'always'. That preserves the historical `5s ago` shape for English while producing locale-correct output for every other locale (zh-CN gets `5秒前` / `45分前`, with the right past / future suffix and word order). The `just now` carve-out (abs < 5s) keeps using t('liveArtifact.refresh.justNow') since Intl's narrow output for zero-delta reads awkwardly. A try/catch around the RTF constructor falls back to 'en' if the runtime rejects the locale, so the function is safe on engines with limited ICU data. Callsites threaded through: - LiveArtifactRefreshHistoryPanel hero metric (`lastRefreshedAt`) - Session timeline event row (`event.startedAt`) - Session timeline event time (`event.at`) - LiveArtifactRefreshFact for the created / last-updated facts; the component now accepts optional `locale` + `t` props and the panel passes them in. Test coverage extension: - The existing zh-CN render test sets a real lastRefreshedAt (now - 45s) and real session-event timestamps, then asserts the Chinese past-tense suffix `前` appears AND the legacy English `Xs ago` / `Xm ago` shapes do NOT. That was the gap lefarcen pointed at: setting `lastRefreshedAt: undefined` couldn't see the regression because no relative-time formatting ran. - Added a small second test for the lastRefreshedAt-undefined empty hero so the original `从未` coverage still pins. Validated: pnpm guard, pnpm --filter @open-design/web typecheck, FileViewer.test.tsx (70/70, +1 new test), locales.test.ts (5/5), full web suite (92 files, 842 tests). --------- Co-authored-by: Nagendhra <nagendhra405@gmail.com>