fix: multiline component attributes

[Princesseuh]

Changes

Fixes an Unterminated string literal error when a quoted attribute on a component contains literal newlines — e.g. a multi-line class="" produced by prettier-plugin-classnames.

Component attributes are emitted into a JS props object ({ "class": "..." }). A raw \n inside that string literal is invalid JS and breaks the generated module.

• Add escape_newlines helper in printer/escape.rs, mirroring the Go compiler's escapeNewlines (\n → \n, \r → \r).
• Apply it alongside escape_double_quotes in the two component props-object paths in components.rs: the scoped-class merge and the general quoted-attribute case. Matches the Go compiler's single use of escapeNewlines in printAttributesToObject.

Testing

• Unit tests for escape_newlines (LF, CR, CRLF, multi-line class, no-op).
• New snapshot fixture multiline_class_attribute_on_component.astro covering the motivating case.

Docs

Bug fix only, no docs needed.

[changeset-bot]

🦋 Changeset detected

Latest commit: 4856182

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@astrojs/compiler-binding	Patch
@astrojs/compiler-rs	Patch

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