test(linter/custom-plugins): snapshot test start, end, range, and loc for comments

[lilnasy]

Part of #14564. Makes the tests for comment spans more comprehensive.

[graphite-app]

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[Copilot]

Pull Request Overview

This PR enhances the unicode-comments test fixture to snapshot precise comment spans by iterating all comments, asserting start/end against range, and reporting per-comment locations for clearer snapshots.

• Add assertions verifying comment.start/end align with comment.range.
• Report each comment with its loc-derived "lines" and value, changing snapshot from a single aggregate to per-comment entries.
• Update snapshot to reflect per-comment diagnostics (11 total) with caret highlights.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
apps/oxlint/test/fixtures/unicode-comments/plugin.ts	Switch to per-comment reporting, add start/end vs range assertions, and include loc info in messages.
apps/oxlint/test/fixtures/unicode-comments/output.snap.md	Update expected snapshot to match per-comment outputs and counts.

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[camc314]

Thank you!