adjust for quotation marks in position of attributes

[dqnykamp]

This PR adjusts the position of attributes so that they do not include the quotation marks. Importantly, this fixes the position of macros (or references) inside attributes.

Fixes #547

[Copilot]

Pull request overview

This PR fixes the position information for text and macro nodes within XML/HTML attribute values to exclude the surrounding quotation marks. Previously, the position data included the quotes, but now it correctly points only to the content inside the quotes.

Key Changes:

• Added an adjustForQuotes parameter to the lezerNodeToPosition utility function that adjusts position offsets by +1 for start and -1 for end to skip quotation marks
• Applied this adjustment when computing positions for attribute value children
• Added test coverage for both text nodes and macro nodes within attribute values

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/parser/src/lezer-to-dast/lezer-to-dast-utils.ts	Added optional adjustForQuotes parameter to lezerNodeToPosition function with logic to adjust offsets to exclude surrounding quotes
packages/parser/src/lezer-to-dast/lezer-to-dast.ts	Applied the quote adjustment when computing position for attribute value text nodes by passing true as the third argument
packages/parser/test/dast-advanced.test.ts	Added two test cases verifying correct position calculation for text nodes and macros within attribute values

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[dqnykamp]

@siefkenj, I hope it is OK if I merge this in shortly.