feat(i18n): register Brazilian Portuguese as a locale

Add pt-BR to the locale list and everything that hangs off it: the
client loader, Intl and date-fns mapping, the reply-language footers of
the Coach and insights prompts (English body, pt-BR footer, the same
path Korean and Dutch take), the citation-coverage normative words, the
no-key fallback copy, the AUDIT-C standard-drink line, country labels,
period search, CSV yes/no cells and the Telegram bare-word aliases.

The locale enums in the extract, managed-profile and record-settings
schemas now derive from the locale list instead of repeating it, and
the five notification and login-alert routes share one isLocale guard
instead of hand-rolled chains, so a later locale is one edit there.
A language tag is matched exactly and case-insensitively before its
primary subtag, so pt-BR and pt-PT browsers land on the Portuguese
bundle rather than English, and AUDIT-C no longer cuts a region tag to
two letters.

PHQ-9, GAD-7 and WHO-5 are not marked validated for pt-BR: the wording
has not been read against the published Brazilian forms, so readers get
the English items plus the existing note.

src/components/charts/__tests__/trend-card-baseline-alignment.test.tsx

@@ -218,7 +218,17 @@ describe("dashboard.*Short keys exist across all six locales", () => {
 
   // Resolved at test time so the assertion runs against the current
   // bundle, not a stale cached snapshot.
-  const locales = ["en", "de", "fr", "es", "it", "pl", "ko", "nl"] as const;
+  const locales = [
+    "en",
+    "de",
+    "fr",
+    "es",
+    "it",
+    "pl",
+    "ko",
+    "nl",
+    "pt-BR",
+  ] as const;
 
   it.each(locales)("%s carries every dashboard.*Short key", async (locale) => {
     const messages = (await import(`../../../../messages/${locale}.json`))

src/components/layout/__tests__/keyboard-shortcuts-dialog.test.tsx

@@ -31,7 +31,7 @@ vi.mock("@/components/ui/responsive-sheet", () => ({
 import { KeyboardShortcutsDialog } from "../keyboard-shortcuts-dialog";
 import { primeLocales } from "@/__tests__/helpers/prime-locales";
 
-primeLocales("de", "es", "fr", "it", "pl", "ko", "nl");
+primeLocales("de", "es", "fr", "it", "pl", "ko", "nl", "pt-BR");
 
 const EVERYTHING = {
   navHrefs: ["/", "/medications", "/labs", "/timeline", "/insights", "/coach"],
@@ -106,7 +106,7 @@ describe("<KeyboardShortcutsDialog>", () => {
     expect(kbd).not.toMatch(/#[0-9a-f]{3,6}|dracula|\[/i);
   });
 
-  it.each(["de", "es", "fr", "it", "pl", "ko", "nl"])(
+  it.each(["de", "es", "fr", "it", "pl", "ko", "nl", "pt-BR"])(
     "is translated in %s",
     (locale) => {
       const html = render({}, locale);

src/components/layout/__tests__/offline-banner.test.tsx

@@ -75,6 +75,7 @@ describe("<OfflineBanner>", () => {
       "pl",
       "ko",
       "nl",
+      "pt-BR",
     ] as const) {
       const m = loadMessages(locale);
       expect(m.offlineBanner.message.length, locale).toBeGreaterThan(0);

src/components/links/__tests__/period-query.test.ts

@@ -8,7 +8,17 @@ import { describe, expect, it } from "vitest";
 import { formatPeriod, parsePeriodQuery } from "../period-query";
 
 const NOW = new Date("2026-10-15T12:00:00.000Z");
-const LOCALES = ["de", "en", "es", "fr", "it", "pl", "ko", "nl"] as const;
+const LOCALES = [
+  "de",
+  "en",
+  "es",
+  "fr",
+  "it",
+  "pl",
+  "ko",
+  "nl",
+  "pt-BR",
+] as const;
 
 function window(term: string, locale: string) {
   const parsed = parsePeriodQuery(term, locale, NOW);

src/components/links/period-query.ts

@@ -52,6 +52,7 @@ export interface PeriodQuery {
 const CONNECTORS: Record<string, readonly string[]> = {
   es: ["de", "del"],
   it: ["del"],
+  pt: ["de", "do"],
 };
 
 const nameCache = new Map<string, ReadonlyArray<[string, number]>>();

src/components/measurement-reminders/__tests__/type-labels-i18n.test.ts

@@ -41,7 +41,7 @@ const REQUIRED_KEYS = [
 ];
 
 describe("measurement-reminder + bulk-share dynamic i18n keys", () => {
-  it("discovers all eight shipped locales", () => {
+  it("discovers all nine shipped locales", () => {
     expect(LOCALES.map((l) => l.locale).sort()).toEqual([
       "de",
       "en",
@@ -51,6 +51,7 @@ describe("measurement-reminder + bulk-share dynamic i18n keys", () => {
       "ko",
       "nl",
       "pl",
+      "pt-BR",
     ]);
   });
 

src/components/settings/__tests__/import-panel.test.tsx

@@ -108,7 +108,7 @@ describe("<ImportPanel> — SSR smoke", () => {
 });
 
 describe("<AppleHealthEstimateWarning>", () => {
-  it.each(["en", "de", "es", "fr", "it", "pl", "ko", "nl"] as const)(
+  it.each(["en", "de", "es", "fr", "it", "pl", "ko", "nl", "pt-BR"] as const)(
     "renders localized estimate disclosure for %s",
     (locale) => {
       const html = render(<AppleHealthEstimateWarning days={3} />, locale);

src/components/settings/__tests__/managed-record-settings-section.test.tsx

@@ -10,7 +10,17 @@ import {
   ManagedRecordSettingsForm,
 } from "../managed-record-settings-section";
 
-const LOCALES = ["de", "en", "es", "fr", "it", "pl", "ko", "nl"] as const;
+const LOCALES = [
+  "de",
+  "en",
+  "es",
+  "fr",
+  "it",
+  "pl",
+  "ko",
+  "nl",
+  "pt-BR",
+] as const;
 
 const render = (
   family: Parameters<typeof ManagedRecordSettingsForm>[0]["family"],

src/components/settings/integrations/__tests__/apple-health-card.test.tsx

@@ -215,7 +215,7 @@ describe("<AppleHealthCard>", () => {
     }
   });
 
-  it.each(["en", "de", "es", "fr", "it", "pl", "ko", "nl"] as const)(
+  it.each(["en", "de", "es", "fr", "it", "pl", "ko", "nl", "pt-BR"] as const)(
     "renders localized Apple Health copy for %s without leaking keys",
     (locale) => {
       statusPayload = { lastSyncedAt: null, health: null };

src/components/settings/integrations/__tests__/integration-health-copy.test.ts

@@ -15,6 +15,7 @@ import itMessages from "../../../../../messages/it.json";
 import ko from "../../../../../messages/ko.json";
 import nl from "../../../../../messages/nl.json";
 import pl from "../../../../../messages/pl.json";
+import ptBR from "../../../../../messages/pt-BR.json";
 
 import {
   diagnosticsText,
@@ -34,6 +35,7 @@ const CATALOGS: Record<Locale, unknown> = {
   pl,
   nl,
   ko,
+  "pt-BR": ptBR,
 };
 
 function translator(locale: Locale) {

src/components/settings/managed-record-settings-section.tsx

@@ -46,6 +46,7 @@ import { SettingsCardActions } from "./_card-actions";
 import { SettingsCardHeader } from "./_card-header";
 import { SettingsCard } from "./settings-card";
 import { DEFAULT_TIMEZONE } from "@/lib/tz/format";
+import { locales } from "@/lib/i18n/config";
 
 interface ManagedRecordSettingsResponse {
   recordId: string;
@@ -411,7 +412,7 @@ function ProfileSettingsForm({
           <option value="">
             {t("settings.sharedRecord.managedSettings.profile.systemDefault")}
           </option>
-          {["de", "en", "es", "fr", "it", "pl", "ko", "nl"].map((locale) => (
+          {locales.map((locale) => (
             <option key={locale} value={locale}>
               {locale}
             </option>

src/components/timeline/__tests__/timeline-rework.test.tsx

@@ -34,7 +34,17 @@ import { TimelineLegend } from "../timeline-view";
 import { useSeriesValueFormat } from "../use-series-value-format";
 import { item, wordsIn } from "./timeline-fixture";
 
-const LOCALES: Locale[] = ["de", "en", "es", "fr", "it", "pl", "ko", "nl"];
+const LOCALES: Locale[] = [
+  "de",
+  "en",
+  "es",
+  "fr",
+  "it",
+  "pl",
+  "ko",
+  "nl",
+  "pt-BR",
+];
 
 function render(node: React.ReactElement, locale: Locale = "en") {
   return renderToStaticMarkup(

src/components/ui/calendar-locale.ts

@@ -1,4 +1,4 @@
-import { de, enUS, es, fr, it, ko, nl, pl } from "date-fns/locale";
+import { de, enUS, es, fr, it, ko, nl, pl, ptBR } from "date-fns/locale";
 import type { Locale as DateFnsLocale } from "date-fns";
 
 import type { Locale } from "@/lib/i18n/config";
@@ -25,6 +25,8 @@ export function resolveDateFnsLocale(locale: Locale): DateFnsLocale {
       return ko;
     case "nl":
       return nl;
+    case "pt-BR":
+      return ptBR;
     default:
       return enUS;
   }