feat: add configurable path suffix cleanup and heredoc formatting

[h4rk8s]

Summary

• add trimPathSuffix and formatHeredoc settings in General preferences
• implement path suffix cleanup (e.g. /path/file.swift:42: -> /path/file.swift)
• implement heredoc block formatting with early return to preserve multiline structure
• keep existing path quoting behavior and merge all related transformations in pipeline
• add test coverage for path quoting, heredoc formatting, and path suffix cleanup

Validation

• swift test passes locally
• pnpm check currently fails on repository-wide baseline SwiftFormat issues in untouched files

[h4rk8s]

@codex

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Match path suffixes on paths containing spaces

The new suffix-cleanup regex only allows non-whitespace characters in the path ([\S]*), so inputs like /Users/me/My Project/file.swift:42: never match and the cleanup silently returns nil. In this case the next pipeline step can still quote the path, but it preserves the :42: suffix, so users still get an unusable path when directories contain spaces (a common macOS case).

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