fix(notifications): the English log formats its numbers in English; the ui/ contract sees msg() keys

A formatted value took the reader's language even when the notice was said in English for the
log. The platform-namespace contract matched only t("…"), so a domain key passed through msg()
in components/ui/ went unseen. Three comments pointed at localizeDetail's old home.

frontend/src/components/ui/uiI18n.contract.test.ts

@@ -19,8 +19,9 @@ const PLATFORM_NAMESPACES = new Set([
 ]);
 
 const files = readSources(__dirname, "./**/*.{ts,tsx}");
-// `t("ns.…")` and `t(\`ns.…\`)` — the namespace is everything before the first dot.
-const KEY = /\bt\(\s*["`]([A-Za-z]+)\./g;
+// `t("ns.…")` and `t(\`ns.…\`)`, and a notice's `msg("ns.…")` (the same key, said when shown) — the
+// namespace is everything before the first dot.
+const KEY = /\b(?:t|msg)\(\s*["`]([A-Za-z]+)\./g;
 
 describe("components/ui/ speaks only platform i18n namespaces", () => {
   it("names no feature namespace", () => {
@@ -37,5 +38,6 @@ describe("components/ui/ speaks only platform i18n namespaces", () => {
 
   it("sees a feature namespace when one is used", () => {
     expect([...'t("plex.loading")'.matchAll(KEY)].map((m) => m[1])).toEqual(["plex"]);
+    expect([...'msg("plex.loading")'.matchAll(KEY)].map((m) => m[1])).toEqual(["plex"]);
   });
 });

frontend/src/lib/notifications.ts

@@ -42,8 +42,10 @@ export function sayNotif(text: NotifText, t: TFunction = i18n.t.bind(i18n)): str
 
 function sayValue(v: NotifValue, t: TFunction): string | number {
   if (typeof v !== "object") return v;
-  if ("number" in v) return formatNumber(v.number, i18n.language);
-  if ("bytes" in v) return formatBytes(v.bytes, i18n.language);
+  // In the language `t` speaks: a fixed one (the English log) names it, a component's follows i18n.
+  const lang = (t as { lng?: string }).lng ?? i18n.language;
+  if ("number" in v) return formatNumber(v.number, lang);
+  if ("bytes" in v) return formatBytes(v.bytes, lang);
   return sayNotif(v, t);
 }
 

frontend/src/modules/settings/SettingsPanel.tsx

@@ -643,7 +643,7 @@ export function DownloadAuth() {
       notify({ level: "success", message: msg("settings.downloadAuth.saved") });
     },
     // Validation errors (empty / not-a-cookies.txt) surface via the global error modal, which
-    // localizes the structured { code: "cookies" } detail (see lib/api core localizeDetail); the
+    // localizes the structured { code: "cookies" } detail (see lib/api/refusalText.ts localizeDetail); the
     // statuses it does not cover go to the app-wide reporter.
     meta: { failTitle: "settings.downloadAuth.failed" },
   });

frontend/src/shell/clientLogWiring.dom.test.tsx

@@ -7,7 +7,8 @@ import { afterEach, describe, expect, it, vi } from "vitest";
 import { cleanup, render } from "@testing-library/react";
 
 import { clear, events } from "../lib/log";
-import { notify, raw } from "../lib/notifications";
+import { msg, notify, raw } from "../lib/notifications";
+import i18n from "../i18n";
 import { reportError } from "../lib/errorDialog";
 import { createQueryClient } from "../lib/queryClient";
 import ErrorBoundary from "./ErrorBoundary";
@@ -31,6 +32,27 @@ describe("client log wiring", () => {
     ]);
   });
 
+  it("records a notice in English whatever the reader's language, its numbers included", async () => {
+    await i18n.changeLanguage("hu");
+    try {
+      notify({
+        message: msg("settings.takeout.read", {
+          name: raw("watch-history.json"),
+          count: 12345,
+          n: { number: 12345 },
+        }),
+      });
+    } finally {
+      await i18n.changeLanguage("en");
+    }
+    const english = i18n.getFixedT("en")("settings.takeout.read", {
+      name: "watch-history.json",
+      count: 12345,
+      n: "12,345",
+    });
+    expect(logged("ui.notify").map((e) => e.msg)).toEqual([english]);
+  });
+
   it("records the blocking error dialog", () => {
     reportError("The server refused", "Couldn't save");
     expect(logged("ui.error_dialog")).toMatchObject([