fix: restore iOS 12 support

[naltatis]

fixes #28429

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider centralising the browserslist configuration (e.g. a shared const targets = browserslistToTargets(browserslist())) and reusing it for both lightningcss and the legacy plugin to avoid them diverging in the future.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider centralising the browserslist configuration (e.g. a shared `const targets = browserslistToTargets(browserslist())`) and reusing it for both `lightningcss` and the `legacy` plugin to avoid them diverging in the future.

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