Changes

• Resolves Cannot find module 'astro:content' #5711

Better handle content type generation failures:

• Generate types when content directory is empty
• Log helpful error when running astro sync without a content directory
• Avoid swallowing config.ts syntax errors from Vite
• Fix: Generate types when the content/ dir is added in dev

Testing

Manual testing: adding and removing the content directory, adding and modifying the config.ts file.

Docs

withastro/docs#2345