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Stirling-PDF/frontend/shared
Reece Browne dffc292888 I18n on portal (#6761)
## Overview

Internationalizes the **developer portal**, which previously had **zero
i18n** — every string was hardcoded across ~118 components. Rather than
stand up a parallel system, this shares the **editor's** existing i18n
setup (same TOML locale format, same Crowdin pipeline), then converts
every portal surface to `react-i18next` and adds a CI guard so coverage
can't regress.

## What's included

### 🔗 Shared i18n core (`@shared/i18n`)
- Extracts the editor's `TomlBackend` (HTTP loader for
`public/locales/{lng}/translation.toml`) and language metadata/helpers
(the 42-language list, RTL set, `LanguageSource` priority, code
normalizers) into `frontend/shared/i18n/`.
- The **editor** now imports and re-exports these from `@shared/i18n` —
its 20+ consumers are unchanged. Its local `tomlBackend.ts` is deleted.
- The **portal** builds its own i18next instance from the shared core,
with **en-US as the source of truth** and the same
`/locales/{lng}/translation.toml` layout.

### 🌍 Full portal coverage
- Every view and component converted to `t()` — all feature areas (home,
pipelines, sources, infrastructure, usage, documents, agent-builder,
editor-admin, policies, users, docs, catalogue, components view) plus
app shell, nav, modals, and the home/domain widgets.
- **1108 keys across ~30 namespaces** in
`portal/public/locales/en-US/translation.toml`, grouped by feature;
shared strings under `[common]`. Plurals use i18next count forms;
dynamic labels (nav, settings sections, status badges) use template keys
against populated tables.
- Data-driven strings (values from `@portal/api/*` mocks, enum/id
values, code samples) are intentionally left untranslated — they're
data, not UI chrome.

###  CI coverage guard
- `portal/scripts/check-i18n.mjs` fails if any static `t("key")` in
portal source is missing from the en-US locale. Wired into
`frontend:check` and `frontend:check:all`, so missed keys break CI. This
mirrors the editor's `missingTranslations` test for the portal, which
has no vitest harness of its own.

## Testing
- `task frontend:check:all` passes locally (typecheck all variants,
lint, format, **portal i18n guard**, builds, tests, storybook).
- Every static `t()` key verified to resolve in the locale (1108 keys /
186 source files); all dynamic key prefixes map to populated tables.
- Runtime sweep of all 12 portal routes shows **no unresolved keys** on
screen; nav labels, plurals, and array-backed copy all render real text.

## Follow-ups (not in this PR)
- **Crowdin** — register `frontend/portal/public/locales/` as a source
so portal strings flow through the same translation pipeline as the
editor (an ops step on the Crowdin side; there's no Crowdin config in
the repo).
- Only `en-US` is populated; other languages will arrive via the
pipeline.
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