feat(i18n): add Lunaria for tracking

[yanthomasdev]

This PR adds https://lunaria.dev (v1 prerelease) to add translation tracking with key completion support. It also generates a dashboard (its the ejected pre-v1 version, since v1 still doesn't have the new dashboard implemented yet) you can build with build:lunaria and access in dist/lunaria/index.html.

I've also added the Lunaria GitHub Action, that will comment on any PRs modifying/adding/removing tracked files (i18n/locales/*.json) with a summary of changes and warn if the translation/source was changed in another PR and it is now outdated, missing keys, etc.

Here's how it looks:

TODO:

• Decide how we will deploy the dashboard - we can inject inside the Nuxt app by changing its output directory, rebuild the dashboard in Nuxt/Vue, or deploy separately and sync with the app's deployment (e.g. making it https://i18n.npmx.dev).
• Add new languages that are added/update Lunaria config with any languages or content structure that are done before this PR is merged.

Here's an example of the final dashboard:

[vercel]

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Project	Deployment	Review	Updated (UTC)
docs.npmx.dev	Ready	Preview, Comment	Jan 28, 2026 4:12pm
npmx.dev	Ready	Preview, Comment	Jan 28, 2026 4:12pm

[danielroe]

let's gooooo! 🚀