fix: import translations lazily

[YDX-2147483647]

Note

This PR is ready for review, but let's resolve typst-jp/docs#335 first.

At present, it's impossible to use en-US translation without a discord URL, because the ja-JP translation is always imported and it will throw the error below.

[vite] (ssr) Error when evaluating SSR module ./src/index.tsx: The ja-JP translation requires to provide both GitHub and Discord social links in metadata.json, but at present: GitHub = https://github.com/typst/typst, Discord = undefined.

This PR fixes it by making the import lazy.

Links

An alternative approach: typst-jp/docs#303 (comment)

Blocks #21

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[3w36zj6]

I've updated typst-jp. The preview build should now succeed.

[YDX-2147483647]

The Netlify build still fails, because I forgot to update the metadata format in netlify-build.sh.
Since you've already extracted the logic into scripts/fetch-docs-assets.sh in #41, could you cherry-pick that commit (7fefd7d78d) into a dedicated PR? I'll rebase this PR after that PR is merged.

[Copilot]

Pull request overview

This PR implements lazy loading of translation modules to prevent build failures when using en-US translation without optional social metadata (Discord URLs). The ja-JP translation requires both GitHub and Discord social links, while en-US does not. By switching from static imports to dynamic imports, each translation is only loaded when needed, avoiding errors when building for languages that don't require special metadata.

Key Changes:

• Replaced static imports with lazy dynamic imports in the translation module, using top-level await with an IIFE to conditionally load the appropriate translation based on the configured language
• Removed dummy Discord URL from test metadata, demonstrating that en-US builds no longer require it
• Enhanced the fetch-docs-assets.sh script with a --skip option to selectively skip downloading specific assets (docs.json, docs-assets, favicon, metadata), enabling more flexible build configurations

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/translation/index.tsx	Converts static translation imports to lazy dynamic imports using top-level await, with detailed comments explaining the rationale for lazy and static import constraints
src/metadata.ts	Removes dummy Discord social link from test fallback metadata, validating that en-US translation works without Discord URLs
scripts/fetch-docs-assets.sh	Adds --skip option with validation to selectively skip downloading docs.json, docs-assets, favicon, or metadata files; updates usage documentation
scripts/netlify-build.sh	Uses the new --skip flags to avoid downloading docs.json and metadata when building ja-JP, since those are fetched separately
.github/workflows/ci.yaml	Adds no-config test matrix to verify builds work without optional metadata; uses --skip flags for metadata and favicon in this configuration

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