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-initialization.ts

@@ -1,4 +1,5 @@
 import { useCallback, useMemo } from "react";
+import { useTranslation } from "react-i18next";
 import type { DaemonClient } from "@getpaseo/client/internal/daemon-client";
 import { useSessionStore } from "@/stores/session-store";
 import {
@@ -9,6 +10,7 @@ import {
   rejectInitDeferred,
 } from "@/utils/agent-initialization";
 import { planInitialAgentTimelineSync, planTimelineTailFetch } from "@/timeline/timeline-sync-plan";
+import { i18n } from "@/i18n/i18next";
 
 export const INIT_TIMEOUT_MS = 30_000;
 
@@ -19,6 +21,7 @@ export interface EnsureAgentIsInitializedInput {
   agentId: string;
   client: Pick<DaemonClient, "fetchAgentTimeline"> | null;
   setAgentInitializing: SetAgentInitializing;
+  hostDisconnectedMessage?: string;
 }
 
 export function ensureAgentIsInitialized(input: EnsureAgentIsInitializedInput): Promise<void> {
@@ -48,7 +51,10 @@ export function ensureAgentIsInitialized(input: EnsureAgentIsInitializedInput):
 
   if (!client) {
     setAgentInitializing(agentId, false);
-    rejectInitDeferred(key, new Error("Host is not connected"));
+    rejectInitDeferred(
+      key,
+      new Error(input.hostDisconnectedMessage ?? i18n.t("workspace.terminal.hostDisconnected")),
+    );
     return deferred.promise;
   }
 
@@ -64,12 +70,13 @@ export interface RefreshAgentInput {
   agentId: string;
   client: Pick<DaemonClient, "refreshAgent" | "fetchAgentTimeline"> | null;
   setAgentInitializing: SetAgentInitializing;
+  hostDisconnectedMessage?: string;
 }
 
 export async function refreshAgent(input: RefreshAgentInput): Promise<void> {
   const { agentId, client, setAgentInitializing } = input;
   if (!client) {
-    throw new Error("Host is not connected");
+    throw new Error(input.hostDisconnectedMessage ?? i18n.t("workspace.terminal.hostDisconnected"));
   }
   setAgentInitializing(agentId, true);
 
@@ -105,6 +112,7 @@ export function useAgentInitialization({
   serverId: string;
   client: DaemonClient | null;
 }) {
+  const { t } = useTranslation();
   const setInitializingAgents = useSessionStore((state) => state.setInitializingAgents);
   const setAgentInitializing = useMemo(
     () => createSetAgentInitializing(serverId, setInitializingAgents),
@@ -113,13 +121,25 @@ export function useAgentInitialization({
 
   const ensureAgentIsInitializedCallback = useCallback(
     (agentId: string): Promise<void> =>
-      ensureAgentIsInitialized({ serverId, agentId, client, setAgentInitializing }),
-    [client, serverId, setAgentInitializing],
+      ensureAgentIsInitialized({
+        serverId,
+        agentId,
+        client,
+        setAgentInitializing,
+        hostDisconnectedMessage: t("workspace.terminal.hostDisconnected"),
+      }),
+    [client, serverId, setAgentInitializing, t],
   );
 
   const refreshAgentCallback = useCallback(
-    (agentId: string): Promise<void> => refreshAgent({ agentId, client, setAgentInitializing }),
-    [client, setAgentInitializing],
+    (agentId: string): Promise<void> =>
+      refreshAgent({
+        agentId,
+        client,
+        setAgentInitializing,
+        hostDisconnectedMessage: t("workspace.terminal.hostDisconnected"),
+      }),
+    [client, setAgentInitializing, t],
   );
 
   return {