Complete client UI i18n migration

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

packages/app/src/hooks/use-project-icon-query.ts

@@ -1,4 +1,5 @@
 import { useQuery } from "@tanstack/react-query";
+import { useTranslation } from "react-i18next";
 import { useHostRuntimeClient, useHostRuntimeIsConnected } from "@/runtime/host-runtime";
 import type { ProjectIcon } from "@getpaseo/protocol/messages";
 
@@ -19,6 +20,7 @@ interface UseProjectIconQueryOptions {
 }
 
 export function useProjectIconQuery({ serverId, cwd }: UseProjectIconQueryOptions) {
+  const { t } = useTranslation();
   const client = useHostRuntimeClient(serverId);
   const isConnected = useHostRuntimeIsConnected(serverId);
 
@@ -26,7 +28,7 @@ export function useProjectIconQuery({ serverId, cwd }: UseProjectIconQueryOption
     queryKey: projectIconQueryKey(serverId, cwd),
     queryFn: async (): Promise<ProjectIcon | null> => {
       if (!client) {
-        throw new Error("Daemon client not available");
+        throw new Error(t("common.errors.daemonClientUnavailable"));
       }
       const result = await client.requestProjectIcon(cwd);
       return result.icon;