fix: ensure ext parameter includes leading dot in path formatting

[ava-grace-zoe]

• Explicitly prepend '.' to ext if missing (e.g., "ts" → ".ts")

[changeset-bot]

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Latest commit: 2f75a28

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[Copilot]

Pull Request Overview

This PR fixes a path formatting issue where the file extension parameter was missing its leading dot. The change ensures that the ext parameter in path.format() includes the required dot prefix for proper file path generation.

• Corrected the ext parameter from "ts" to ".ts" in the path formatting call

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[smorimoto]

bugbot run

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[smorimoto]

It's not required: https://nodejs.org/api/path.html#pathformatpathobject