Complete client UI i18n migration

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

packages/app/src/hooks/use-daemon-config.ts

@@ -1,5 +1,6 @@
 import { useCallback, useEffect, useMemo } from "react";
 import { useQuery, useQueryClient } from "@tanstack/react-query";
+import { useTranslation } from "react-i18next";
 import type { MutableDaemonConfig, MutableDaemonConfigPatch } from "@getpaseo/protocol/messages";
 import { useHostRuntimeClient, useHostRuntimeIsConnected } from "@/runtime/host-runtime";
 
@@ -14,6 +15,7 @@ interface UseDaemonConfigResult {
 }
 
 export function useDaemonConfig(serverId: string | null): UseDaemonConfigResult {
+  const { t } = useTranslation();
   const queryClient = useQueryClient();
   const client = useHostRuntimeClient(serverId ?? "");
   const isConnected = useHostRuntimeIsConnected(serverId ?? "");
@@ -25,7 +27,7 @@ export function useDaemonConfig(serverId: string | null): UseDaemonConfigResult
     staleTime: Infinity,
     queryFn: async () => {
       if (!client) {
-        throw new Error("Host is not connected");
+        throw new Error(t("workspace.terminal.hostDisconnected"));
       }
       const result = await client.getDaemonConfig();
       return result.config;