fix: update HMR condition to exclude test mode

[Jungzl]

Disable HMR injection in test mode.

This plugin previously injected solid-refresh HMR code into every transformed module when running vitest. The injected if (import.meta.hot) branch does not exist in the source, which made coverage reports (e.g. vitest run --coverage) show branches/lines that do not match the source.

Although we can pass { hot: false } to escape the situation, it's better to bypass all test scenarios by default.

Test mode now skips HMR injection so coverage mappings align with the source.

[changeset-bot]

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Latest commit: 784ceef

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