feat(i18n): add Hindi (24 dictionaries, 25 codes, all 100%)

- Full 8,703-key Hindi dictionary in src/i18n/hi (7 namespace batches),
  placeholders verified, only 2% identical strings (brand/protocol names).
- Register hi in Language/LANGUAGE_LOADERS, detectLanguage (hi-IN),
  LanguageToggle (🇮🇳, हिन्दी) and dateFnsI18n (hi-IN).
- Lazy-load Noto Sans Devanagari for hi via lib/localeFonts.ts (renamed from
  cjkFonts.ts) and add it to the CSS font stack; other locales don't download it.
- check-i18n covers hi: 24 dictionaries / 25 codes at 100%; tsc/tests/build green.

AGENTS.md

@@ -2688,7 +2688,7 @@ similar are internal endpoints/hook names, not credits — leave them.)
   is now **multi-way** — en/es stay key-for-key identical (unchanged), `th` (and
   `ja`) may be partial and are reported as **coverage %**; a `th`/`ja` key absent
   from `en` fails.
-- **Font:** `@fontsource/kanit` (Kanit), **lazy-loaded per locale** (`lib/cjkFonts.ts`) and added to the
+- **Font:** `@fontsource/kanit` (Kanit), **lazy-loaded per locale** (`lib/localeFonts.ts`) and added to the
   CSS + Tailwind font stacks — ⚠️ Outfit/Inter/Bebas/Barlow have **no Thai
   glyphs**, so without it Thai silently falls back to a system font.
 - **Detection:** a Thai-device browser (`th*`) starts in `th` (`detectLanguage`).
@@ -2697,18 +2697,19 @@ similar are internal endpoints/hook names, not credits — leave them.)
   stays English (spot, park, bowl, DIY, vert, crew, line, Stash, The Lab, Nostr,
   Lightning, Zap, Relay, sats) because Thai skaters use the English terms.
 
-### Catalan, Basque, Galician + pt-PT — 23 dictionaries, 24 codes, all 100% (2026-10-26)
-- Added **ca (Català), eu (Euskara), gl (Galego)** → **23 dictionaries**;
-  **pt-PT** is a variant that shares the `pt` dictionary (24 selectable codes).
-- Registered in `Language` + `LANGUAGE_LOADERS`, `detectLanguage` (ca/eu/gl
+### Catalan, Basque, Galician, Hindi + pt-PT — 24 dictionaries, 25 codes, all 100% (2026-10-26)
+- Added **ca (Català), eu (Euskara), gl (Galego), hi (हिन्दी)** → **24
+  dictionaries**; **pt-PT** is a variant that shares the `pt` dictionary
+  (25 selectable codes).
+- Registered in `Language` + `LANGUAGE_LOADERS`, `detectLanguage` (ca/eu/gl/hi
   checked before `es`; `pt-BR`→`pt`, `pt-PT`→`pt-PT`), the `LanguageToggle`
-  list, and `dateFnsI18n` (date-fns `ca`/`eu`/`gl`/`pt`, codes
-  `ca-ES`/`eu-ES`/`gl-ES`/`pt-BR`/`pt-PT`).
+  list, and `dateFnsI18n` (date-fns `ca`/`eu`/`gl`/`hi`/`pt`, codes
+  `ca-ES`/`eu-ES`/`gl-ES`/`hi-IN`/`pt-BR`/`pt-PT`).
 - **Flags are real SVGs** in `public/flags/` for `ca`, `eu`, `gl` and `gb-eng`
   (there are no Unicode region flags for Catalonia/Basque/Galicia, and England
   is not the UK flag). `LanguageToggle` renders a path as `<img>` and an emoji
-  as text. **English now uses the England flag** (not the UK), and Portuguese
-  has **Brasil 🇧🇷** (`pt`) + **Portugal 🇵🇹** (`pt-PT`).
+  as text. **English now uses the England flag** (not the UK), Portuguese has
+  **Brasil 🇧🇷** (`pt`) + **Portugal 🇵🇹** (`pt-PT`), and Hindi uses 🇮🇳.
 - **`pt-PT`** shares the `pt` base and applies a European drift
   (`src/i18n/pt-PT/drift.ts`: Salvar→Guardar, Senha→Palavra-passe,
   Ônibus→Autocarro, etc.). A full European-Portuguese review is a follow-up.
@@ -2718,15 +2719,18 @@ similar are internal endpoints/hook names, not credits — leave them.)
   covering the surface (no grey bands), while still letting you drag across the
   antimeridian to Hawaii/Pacific. On a wide desktop the whole globe cannot also
   fit without distortion; the clamp prioritises coverage.
-- Full dictionaries in `src/i18n/{ca,eu,gl}/` — 7 namespace batches each
+- Full dictionaries in `src/i18n/{ca,eu,gl,hi}/` — 7 namespace batches each
   (8,703 keys), composed in `index.ts`; placeholders verified, only 2–4%
   identical strings (brand/protocol names). `check-i18n.mjs` includes them in
   `extraLocales` and reports 100%.
-- Latin script, so **no new font**; each locale lazy-loads like the rest.
+- Catalan/Galician/Portuguese are Latin; **Hindi is Devanagari**, so
+  `@fontsource/noto-sans-devanagari` (400/500/700) is **lazy-loaded** for `hi`
+  via `lib/localeFonts.ts` (same pattern as CJK) and the CSS stack includes
+  `'Noto Sans Devanagari'` before `system-ui`.
 - Translation sources were split by namespace into
   `/tmp/opencode/i18n-src/batch1..7.json` (regenerate from `en.ts` if
   re-translating). When adding new UI strings, add them to `en`/`es` **and all
-  23 locales** (batch file or `drift.ts`).
+  24 dictionaries (25 codes)** (batch file or `drift.ts`).
 
 ### i18n drift closed — all 20 locales 100% (2026-10-13)
 - Every non-en/es locale had fallen to **97%** (245 keys each — `trustUi`,
@@ -2753,7 +2757,7 @@ similar are internal endpoints/hook names, not credits — leave them.)
   bloats the app. Each language is its own on-demand chunk.
 - **Fonts:** added **Noto Sans KR** (Korean) and **Inter** (Cyrillic/Russian) to
   the CSS + Tailwind stacks; JP/KR/TH each need their own font (Outfit/Inter
-  lack CJK). **(2026-10-12) CJK fonts are lazy-loaded per locale** (`lib/cjkFonts.ts`,
+  lack CJK). **(2026-10-12) CJK fonts are lazy-loaded per locale** (`lib/localeFonts.ts`,
   wired in `contexts/LanguageContext.tsx`) — they're ~16 MB of font payload that
   non-CJK users no longer download at boot.
 - `check-i18n.mjs` now reports **all 12**; new locales are *partial* (coverage %)
@@ -2775,7 +2779,7 @@ similar are internal endpoints/hook names, not credits — leave them.)
   Both partial-locale rules below still hold for any *future* keys.
 - **Partial by design** (same as `th`): a missing `ja` key falls back to English.
   `check-i18n.mjs` reports `ja` coverage and fails if a `ja` key is absent from `en`.
-- **Font:** `@fontsource/noto-sans-jp` (Noto Sans JP), **lazy-loaded per locale** (`lib/cjkFonts.ts`) and
+- **Font:** `@fontsource/noto-sans-jp` (Noto Sans JP), **lazy-loaded per locale** (`lib/localeFonts.ts`) and
   added to the CSS + Tailwind font stacks — ⚠️ Outfit/Inter/Bebas/Barlow/Kanit have
   **no Japanese glyphs**, so without it Japanese falls back to a system font.
 - **Detection:** a Japanese-device browser (`ja*`) starts in `ja` (`detectLanguage`).

package-lock.json

@@ -24,6 +24,7 @@
         "@fontsource/barlow-condensed": "^5.2.8",
         "@fontsource/bebas-neue": "^5.2.7",
         "@fontsource/kanit": "^5.3.0",
+        "@fontsource/noto-sans-devanagari": "^5.3.0",
         "@fontsource/noto-sans-jp": "^5.3.0",
         "@fontsource/noto-sans-kr": "^5.3.0",
         "@getalby/sdk": "^5.1.1",
@@ -1531,6 +1532,15 @@
         "url": "https://github.com/sponsors/ayuhito"
       }
     },
+    "node_modules/@fontsource/noto-sans-devanagari": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/@fontsource/noto-sans-devanagari/-/noto-sans-devanagari-5.3.0.tgz",
+      "integrity": "sha512-7khYmipS/5KAUUmrO1DKir8yL8XI00d0+ZE9BqbS8XF1jzObv6CpPOk3UeYxF+Pvi8bx9bBvprBCOcbx/eQWTQ==",
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
     "node_modules/@fontsource/noto-sans-jp": {
       "version": "5.3.0",
       "resolved": "https://registry.npmjs.org/@fontsource/noto-sans-jp/-/noto-sans-jp-5.3.0.tgz",

package.json

@@ -44,6 +44,7 @@
     "@fontsource/barlow-condensed": "^5.2.8",
     "@fontsource/bebas-neue": "^5.2.7",
     "@fontsource/kanit": "^5.3.0",
+    "@fontsource/noto-sans-devanagari": "^5.3.0",
     "@fontsource/noto-sans-jp": "^5.3.0",
     "@fontsource/noto-sans-kr": "^5.3.0",
     "@getalby/sdk": "^5.1.1",

scripts/check-i18n.mjs

@@ -130,7 +130,7 @@ async function main() {
   const jaCoverage = en.size ? Math.round(((en.size - missingJa) / en.size) * 100) : 100;
 
   // 5. Additional partial locales (same rules as th/ja).
-  const extraLocales = ['pt', 'pt-PT', 'fr', 'de', 'it', 'nl', 'pl', 'ru', 'ko', 'zh-CN', 'zh-TW', 'uk', 'tr', 'vi', 'id', 'sv', 'cs', 'ro', 'el', 'ca', 'eu', 'gl'];
+  const extraLocales = ['pt', 'pt-PT', 'fr', 'de', 'it', 'nl', 'pl', 'ru', 'ko', 'zh-CN', 'zh-TW', 'uk', 'tr', 'vi', 'id', 'sv', 'cs', 'ro', 'el', 'ca', 'eu', 'gl', 'hi'];
   const extraStats = [];
   for (const lang of extraLocales) {
     const dict = flatten(await loadTranslations(join(SRC, `i18n/${lang}/index.ts`)));

src/components/LanguageToggle.tsx

@@ -45,6 +45,7 @@ const languages: LanguageOption[] = [
   { code: 'el', name: 'Greek', nativeName: 'Ελληνικά', flag: '🇬🇷' },
   { code: 'vi', name: 'Vietnamese', nativeName: 'Tiếng Việt', flag: '🇻🇳' },
   { code: 'tr', name: 'Turkish', nativeName: 'Türkçe', flag: '🇹🇷' },
+  { code: 'hi', name: 'Hindi', nativeName: 'हिन्दी', flag: '🇮🇳' },
 ];
 
 interface LanguageToggleProps {

src/contexts/LanguageContext.tsx

@@ -10,7 +10,7 @@ import {
   type Translations,
 } from './language';
 import { setDateLocale } from '@/lib/dateFnsI18n';
-import { loadCjkFont } from '@/lib/cjkFonts';
+import { loadLocaleFont } from '@/lib/localeFonts';
 
 interface LanguageProviderProps {
   children: ReactNode;
@@ -52,6 +52,7 @@ function detectLanguage(): Language {
   if (tags.some((t) => t.startsWith('ca'))) return 'ca';
   if (tags.some((t) => t.startsWith('eu'))) return 'eu';
   if (tags.some((t) => t.startsWith('gl'))) return 'gl';
+  if (tags.some((t) => t.startsWith('hi'))) return 'hi';
   if (tags.some((t) => t.startsWith('es'))) return 'es';
   return 'en';
 }
@@ -85,7 +86,7 @@ export function LanguageProvider({ children }: LanguageProviderProps) {
   // Lazy-load the CJK display font for the active locale (ja/ko/th) — large font
   // files that non-CJK users no longer have to download at boot.
   useEffect(() => {
-    loadCjkFont(language);
+    loadLocaleFont(language);
   }, [language]);
 
   const setLanguage = useCallback((lang: Language) => {

src/contexts/language.ts

@@ -7,7 +7,7 @@ import en from '@/i18n/en';
  * `react-refresh/only-export-components` rule.
  */
 
-export type Language = 'en' | 'es' | 'ca' | 'eu' | 'gl' | 'th' | 'ja' | 'pt' | 'pt-PT' | 'fr' | 'de' | 'it' | 'nl' | 'pl' | 'ru' | 'ko' | 'ko-KP' | 'zh-CN' | 'zh-TW' | 'uk' | 'tr' | 'vi' | 'id' | 'sv' | 'cs' | 'ro' | 'el';
+export type Language = 'en' | 'es' | 'ca' | 'eu' | 'gl' | 'hi' | 'th' | 'ja' | 'pt' | 'pt-PT' | 'fr' | 'de' | 'it' | 'nl' | 'pl' | 'ru' | 'ko' | 'ko-KP' | 'zh-CN' | 'zh-TW' | 'uk' | 'tr' | 'vi' | 'id' | 'sv' | 'cs' | 'ro' | 'el';
 
 type TranslationKey = string;
 type TranslationValue = string | { [key: string]: TranslationValue };
@@ -42,6 +42,7 @@ export const LANGUAGE_LOADERS: Record<Language, () => Promise<Translations>> = {
   ca: () => import('@/i18n/ca').then((m) => m.default),
   eu: () => import('@/i18n/eu').then((m) => m.default),
   gl: () => import('@/i18n/gl').then((m) => m.default),
+  hi: () => import('@/i18n/hi').then((m) => m.default),
   th: () => import('@/i18n/th').then((m) => m.default),
   ja: () => import('@/i18n/ja').then((m) => m.default),
   pt: () => import('@/i18n/pt').then((m) => m.default),

src/i18n/hi/drift.ts

@@ -0,0 +1,4 @@
+/** Post-translation corrections for hi. */
+const drift = {};
+
+export default drift;

src/i18n/hi/index.ts

@@ -0,0 +1,24 @@
+import batch1 from './batch1';
+import batch2 from './batch2';
+import batch3 from './batch3';
+import batch4 from './batch4';
+import batch5 from './batch5';
+import batch6 from './batch6';
+import batch7 from './batch7';
+import drift from './drift';
+import { deepMerge } from '../deepMerge';
+
+const hi = deepMerge(
+  {
+    ...batch1,
+    ...batch2,
+    ...batch3,
+    ...batch4,
+    ...batch5,
+    ...batch6,
+    ...batch7,
+  },
+  drift,
+);
+
+export default hi;

src/index.css

@@ -149,18 +149,18 @@
 /* ── Display font utilities ───────────────────────────────────────────────── */
 /* Bebas Neue — used for all major headlines */
 .font-display {
-  font-family: 'Bebas Neue', 'Kanit', 'Noto Sans JP', 'Noto Sans KR', 'Impact', 'Arial Black', sans-serif;
+  font-family: 'Bebas Neue', 'Kanit', 'Noto Sans JP', 'Noto Sans KR', 'Noto Sans Devanagari', 'Impact', 'Arial Black', sans-serif;
   letter-spacing: 0.04em;
 }
 
 /* Barlow Condensed — used for subheadings, labels, nav */
 .font-condensed {
-  font-family: 'Barlow Condensed', 'Kanit', 'Noto Sans JP', 'Noto Sans KR', 'Arial Narrow', sans-serif;
+  font-family: 'Barlow Condensed', 'Kanit', 'Noto Sans JP', 'Noto Sans KR', 'Noto Sans Devanagari', 'Arial Narrow', sans-serif;
 }
 
 .neon-header {
   animation: neon-glow 2s ease-in-out infinite;
-  font-family: 'Bebas Neue', 'Kanit', 'Noto Sans JP', 'Noto Sans KR', 'Impact', 'Arial Black', sans-serif;
+  font-family: 'Bebas Neue', 'Kanit', 'Noto Sans JP', 'Noto Sans KR', 'Noto Sans Devanagari', 'Impact', 'Arial Black', sans-serif;
   letter-spacing: 0.06em;
 }
 
@@ -714,7 +714,7 @@ select {
   position: relative;
   overflow: hidden;
   flex-shrink: 0;
-  font-family: 'Inter Variable', 'Inter', 'Kanit', 'Noto Sans JP', 'Noto Sans KR', system-ui, sans-serif;
+  font-family: 'Inter Variable', 'Inter', 'Kanit', 'Noto Sans JP', 'Noto Sans KR', 'Noto Sans Devanagari', system-ui, sans-serif;
   box-shadow: 0 8px 40px rgba(0,0,0,0.6), 0 2px 8px rgba(0,0,0,0.4);
 }
 

src/lib/dateFnsI18n.ts

@@ -25,6 +25,7 @@ import {
   ca as caLocale,
   eu as euLocale,
   gl as glLocale,
+  hi as hiLocale,
   th as thLocale,
   ja as jaLocale,
   ptBR as ptLocale,
@@ -67,6 +68,9 @@ export function setDateLocale(language: Language): void {
   } else if (language === 'gl') {
     activeLocale = glLocale;
     activeCode = 'gl-ES';
+  } else if (language === 'hi') {
+    activeLocale = hiLocale;
+    activeCode = 'hi-IN';
   } else if (language === 'th') {
     activeLocale = thLocale;
     activeCode = 'th-TH';

src/lib/localeFonts.ts

@@ -3,15 +3,17 @@ import type { Language } from '@/contexts/language';
 const loaded = new Set<Language>();
 
 /**
- * Lazy-load the CJK display font for the active locale.
+ * Lazy-load the script-specific display font for the active locale (CJK +
+ * Devanagari).
  *
- * The Thai (Kanit), Japanese (Noto Sans JP) and Korean (Noto Sans KR) font
- * families are large and only needed for users on those locales — but they were
- * imported statically in main.tsx, so every visitor downloaded them. They are
- * now loaded on demand, once per locale, and non-CJK users never fetch them.
- * Text briefly falls back to a system font until the stylesheet resolves.
+ * The Thai (Kanit), Japanese (Noto Sans JP), Korean (Noto Sans KR) and Hindi
+ * (Noto Sans Devanagari) font families are large and only needed for users on
+ * those locales — but they were imported statically in main.tsx, so every
+ * visitor downloaded them. They are now loaded on demand, once per locale, and
+ * other users never fetch them. Text briefly falls back to a system font until
+ * the stylesheet resolves.
  */
-export function loadCjkFont(language: Language): void {
+export function loadLocaleFont(language: Language): void {
   if (loaded.has(language)) return;
   loaded.add(language);
 
@@ -34,5 +36,11 @@ export function loadCjkFont(language: Language): void {
       import('@fontsource/kanit/600.css'),
       import('@fontsource/kanit/700.css'),
     ]).catch(() => {});
+  } else if (language === 'hi') {
+    void Promise.all([
+      import('@fontsource/noto-sans-devanagari/400.css'),
+      import('@fontsource/noto-sans-devanagari/500.css'),
+      import('@fontsource/noto-sans-devanagari/700.css'),
+    ]).catch(() => {});
   }
 }

src/main.tsx

@@ -34,9 +34,10 @@ import '@fontsource/bebas-neue';
 import '@fontsource/barlow-condensed/400.css';
 import '@fontsource/barlow-condensed/600.css';
 import '@fontsource/barlow-condensed/700.css';
-// CJK fonts (Thai Kanit, Noto Sans JP, Noto Sans KR) are NOT imported here —
-// they're large and only needed for ja/ko/th users, so they're lazy-loaded per
-// locale (lib/cjkFonts.ts, wired in contexts/LanguageContext.tsx).
+// Script fonts (Thai Kanit, Noto Sans JP/KR, Noto Sans Devanagari) are NOT
+// imported here — they're large and only needed for ja/ko/th/hi users, so
+// they're lazy-loaded per locale (lib/localeFonts.ts, wired in
+// contexts/LanguageContext.tsx).
 // Cyrillic (Russian) — Inter has Cyrillic; Outfit does not
 import '@fontsource-variable/inter';