Complete client UI i18n migration

Adds client-side i18n support, language settings, translated UI copy, and locale parity coverage.

packages/app/src/hooks/use-agent-history.ts

@@ -5,6 +5,7 @@ import type {
 } from "@getpaseo/client/internal/daemon-client";
 import { useInfiniteQuery } from "@tanstack/react-query";
 import { useCallback, useMemo } from "react";
+import { useTranslation } from "react-i18next";
 import type { AggregatedAgent } from "@/hooks/use-aggregated-agents";
 import { useHostRuntimeClient, useHostRuntimeIsConnected, useHosts } from "@/runtime/host-runtime";
 import { buildAgentDirectoryState } from "@/utils/agent-directory-sync";
@@ -76,6 +77,7 @@ export function useAgentHistory(options: {
   serverId?: string | null;
   enabled?: boolean;
 }): AgentHistoryResult {
+  const { t } = useTranslation();
   const daemons = useHosts();
   const serverId = useMemo(() => {
     const value = options.serverId;
@@ -102,7 +104,7 @@ export function useAgentHistory(options: {
       lastPage.pageInfo.hasMore ? lastPage.pageInfo.nextCursor : null,
     queryFn: async ({ pageParam }) => {
       if (!serverId || !client) {
-        throw new Error("Host is not connected");
+        throw new Error(t("workspace.terminal.hostDisconnected"));
       }
       return fetchAgentHistoryPage({ client, serverId, cursor: pageParam });
     },