refactor(i18n)!: consume the shared runtime from @stream-io/i18n

[oliverlaz]

Tracked in REACT-1172

Retargets every stream-chat/i18n import to @stream-io/i18n, where the shared runtime now lives. The API is unchanged — only the specifier moves.

BREAKING — requires @stream-io/i18n and stream-chat@^10.0.0-rc.10.

⚠️ CI will fail the install step until the dependencies publish

@stream-io/i18n@1.0.0 and stream-chat@10.0.0-rc.10 are not on npm yet, so yarn.lock cannot be regenerated and is deliberately left untouched in this PR. Everything else is reviewable now. Locally this was verified against packed tarballs of both.

What changed

• Every stream-chat/i18n import → @stream-io/i18n (5 files plus the codegen script).
• languageNameDefaults / LanguageNameCatalog now come from stream-chat's root barrel — they enumerate the languages the Chat API can auto-translate a message into, so they stayed with Chat.
• TranslationContext and useStreami18n are built on the shared bindings in @stream-io/i18n/react, so this SDK and React Native stop carrying two copies of the same context plumbing and store subscription.

What stays this SDK's own: the catalog-typed t, the notification translation topic, and supplying a context default rather than throwing — which is what lets a primitive render outside <Chat> (React Native throws instead, which is why the shared factory takes that as an option).

@stream-io/i18n is a regular dependency, not a peer: an integrator never imports it — they import the Streami18n this package subclasses and re-exports.

Also fixes: yarn types checked nothing

It ran tsc with no --project, so it picked up the root solution file ("files": []) and exited 0 even with a deliberate type error in src/. It is now tsc -p tsconfig.lib.json --noEmit, verified to fail on a planted error, and added to CI — which previously typechecked only the build scripts, so a library type error could reach master. CLAUDE.md / AGENTS.md updated accordingly (they documented the trap rather than fixing it).

Verification

yarn types (the real one), yarn lint, and 2,769 tests all pass against locally-linked builds of @stream-io/i18n and stream-chat. Also verified end-to-end in the Vite example: switching language at runtime updates copy, plurals, placeholders, aria-labels and dates — Tue, 2 Aug → Di., 2. Aug., 08/02/2022 → 02.08.2022 — with no reload.

Merge order

After js-toolkit#51 and stream-chat-js#1861, then rerun yarn install to commit a real lockfile.

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