More improvements to match output

[hadley]

Particularly focussing on multiline outputs

[gaborcsardi]

Fancy!

[claude]

Claude finished @hadley's task —— View job

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PR Review - More improvements to match output

• Analyze main implementation changes in R/expect-match.R
• Review test files and snapshots for issues
• Assess UTF-8 concerns from review comments
• Provide final review feedback

Issue identified: The UTF-8 pipe character │ (U+2502) in show_text() function at R/expect-match.R:160 could cause cross-platform compatibility issues. While cli::is_utf8_output() provides a fallback to |, the snapshots contain the UTF-8 characters which may fail on non-UTF-8 systems.

Potential fix: Tests should use local_reproducible_output(unicode = FALSE) for snapshot tests to avoid UTF-8 character issues, or add platform-specific snapshot handling.