feat(target): add support for baseline-widely-available target

[sxzz]

• This PR contains AI-generated code, but I have carefully reviewed it myself. Otherwise, my PR may be closed.

Description

Adds support for target: 'baseline-widely-available' (similar to Vite), which expands to ['chrome111', 'edge111', 'firefox114', 'safari16.4', 'ios16.4']. This works for both the top-level target and css.target options, so users no longer need to hardcode and maintain browser version floors manually.

Also ports Vite's generate-target.ts script (adapted for Oxc) to regenerate the baseline browser targets from baseline-browser-mapping.

Linked Issues

Fixes #893

Additional context

The hardcoded targets match Vite's current baseline-widely-available values (date: 2026-01-01). The scripts/generate-target.ts script can be run to update them on future major releases.

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commit: b7aaede

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