Respect prettier-ignore comments before formatting ranges - #20194

Description

Fixes #20164.

Range formatting reparses only the selected source text. When a prettier-ignore comment is immediately before the selected statement, it was left out of that text and the statement was formatted anyway.

Attach comments before selecting the range, keep ignored source elements intact when the selection falls inside them, and include their leading comments in the text being reparsed. Ordinary comments still allow formatting, and nonignored statements within the selected range are still formatted.

Adds snapshots covering line/block ignore comments, nested ignored statements, selections inside ignored functions, surrounding statements, and a range containing both ignored and nonignored statements. Adds cursor-offset and CRLF tests.

Testing on Linux with Node 22.23.3:

• New fixture: 91 tests and 7 snapshots passed.
• Unit and range-related suite: 1,476 tests and 353 snapshots passed.
• JavaScript/TypeScript/Flow format suites: 29,104 tests and 8,341 snapshots passed.
• Targeted cursor/debug API integration tests: 8 passed.
• Typecheck, modified-code ESLint, fixture lint, and formatting checks passed.

The full integration suite, macOS, and production standalone/browser tests were not run to completion.

Checklist

• I've added tests to confirm my change works.
• (If changing the API or CLI) I've documented the changes I've made (in the docs/ directory).
• (If the change is user-facing) I've added my changes to changelog_unreleased/*/XXXX.md file following changelog_unreleased/TEMPLATE.md.
• I've read the contributing guidelines.
• I did not use AI to generate this PR.
• (If the above is not checked) I have reviewed the AI-generated content before submitting.

AI assistance was used to investigate the bug, write the patch and tests, and prepare this description. There are no API or CLI changes. The changelog filename and PR-number placeholder will be updated after this PR is opened.