fix(turbopack): patch lightningcss to handle unparseable @container conditions

[Larslllllll]

Summary

Turbopack's CSS parser (lightningcss) fails to build projects that use CSS containing @container <name> { ... } named container queries, reporting:

Parsing CSS source code failed / Unexpected end of input on the named container query

This affects real-world CSS from libraries like nhsuk-frontend.

Root Cause

In lightningcss/src/parser.rs, the @container rule parsing has this error handling:

Err(e) => {
  if name.is_some() && input.is_exhausted() {
    AtRulePrelude::Container(name, None)
  } else {
    return Err(e);  // Fails for named queries with no condition
  }
}

When parsing @container scroll-content { ... }, input.is_exhausted() is false (because { is waiting), so the error is propagated instead of being handled gracefully.

Fix

Check self.options.error_recovery before returning the error. When error recovery is enabled (which Turbopack uses), use ContainerCondition::Unknown for unparseable conditions:

Err(e) => {
  if name.is_some() && input.is_exhausted() {
    AtRulePrelude::Container(name, None)
  } else if self.options.error_recovery {
    self.options.warn(e);
    AtRulePrelude::Container(name, Some(
      ContainerCondition::Unknown(TokenList::parse(input, &self.options, 0)?)
    ))
  } else {
    return Err(e);
  }
}

The fix is in a patched fork of lightningcss: https://github.com/Larslllllll/lightningcss/tree/fix/container-error-recovery
A PR has been submitted to upstream: parcel-bundler/lightningcss#1330

Fixes #98261

[vercel-security-reviewer]

Security review details

[vercel]

Suggested change

	lightningcss = { git = "https://github.com/Larslllllll/lightningcss.git", branch = "fix/container-error-recovery", tag = "v1.0.0-alpha.72.fix" }
	lightningcss = { git = "https://github.com/Larslllllll/lightningcss.git", tag = "v1.0.0-alpha.72.fix" }

The lightningcss [patch.crates-io] git entry specifies both branch and tag, which Cargo rejects as an ambiguous source specification, breaking all workspace Cargo commands.