Fix: ignore.files not excluding some project files

[jordan-sussman]

Summary

Addresses #86 by fixing an issue where files listed in ignore.files were not being excluded as expected. Previously, absolute file paths prevented the ignore patterns from matching project-relative globs.

What changed

Updates filter-diagnostics.ts to ensure ignore.files patterns correctly exclude matching project files by normalizing file paths to be relative to the project root.

Files

packages/react-doctor/src/utils/filter-diagnostics.ts

Validation

• Add or run a test with ignore.files containing a project-relative glob (e.g., resources/js/components/ui/**).
• Verify that diagnostics from files matching the glob are excluded.
• Confirm that diagnostics from files not matching the glob still appear.
• Tests continue passing in filter-diagnostics.test.ts

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