test(e2e): 覆盖 Taro H5 CSS 优先级回归

[sonofmagic]

变更说明

• 在 Taro Vite React 与 Webpack React demo 中设置相反的 NutUI/Tailwind import 顺序
• 验证 Tailwind 先、NutUI 后时，普通 rounded-full 由 NutUI 按 source order 胜出
• 验证 NutUI 先、Tailwind 后时，普通 rounded-full 由 Tailwind 按 source order 胜出
• 验证 rounded-full! 在两种顺序下均通过 !important 稳定覆盖 NutUI
• 增加生产 H5 CSS 的 import 顺序、未分层规则断言与 Playwright computed-style 浏览器断言
• 更新 Taro Vite/Webpack 的传统 static 快照，以及 generator weapp、web、web-compact 全局报告基线
• 允许专用分包回归 demo subpackage-uni-app-vite-tailwindcss-v4 启用 styleInjector，同时保持其他普通 demo 的禁止规则不变

本地验证

• pnpm exec vitest run --bail=1 -c ./e2e/vitest.e2e.config.ts e2e/taro-h5-build-smoke.test.ts -t "taro (vite|webpack) react Tailwind v4"
• pnpm exec vitest run --bail=1 -c ./e2e/vitest.e2e.config.ts e2e/taro-web-demo-hmr.test.ts -t "taro (vite|webpack) react Tailwind v4"
• E2E_SKIP_OPEN_AUTOMATOR=1 pnpm exec vitest run -c ./e2e/vitest.e2e.config.ts e2e/taro-vite-react-tailwindcss-v4.test.ts e2e/taro-webpack-react-tailwindcss-v4.test.ts
• pnpm e2e:apps-generator
• pnpm exec vitest run --project=weapp-tailwindcss packages/weapp-tailwindcss/test/ci/workflows.test.ts
• git diff --check

发布影响

• 不修改发布包行为，无需 changeset
• 不涉及模板或脚手架，无需联动 create-weapp-vite

Refs #850

[changeset-bot]

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