fix(components): Flatten Select css selectors

[edison-cy-yang]

Why Is This Changing?

• Lightning CSS minify throws SyntaxError: [lightningcss minify] Invalid state in vite:css-post against @jobber/components's built Select CSS, blocking consumers that use Vite + Lightning CSS for CSS minification.
• The crash trips on the selector chain .select::picker(select)::picker(select) in dist/styles.css — a stacked pseudo-element shape Lightning CSS's parser bails on.
• Consumers have had to pin cssMinify: "esbuild" as a workaround; this change removes the need for that fallback.

What Is Changing?

• Flatten a nested CSS rule in Select.module.css so the built output no longer contains the stacked ::picker(select)::picker(select) chain.
• Dropdown styling (box-shadow, margin, padding, border, border-radius, background) is merged into the existing single-level &::picker(select) block that already holds the transitions.

Consumer Impact

• Impact: Low
• Action required: None (consumers using Vite + Lightning CSS can drop any cssMinify: "esbuild" workaround)
• Breaking change: No

Validation

• Built @jobber/components and confirmed grep '::picker(select)::picker(select)' packages/components/dist/styles.css returns 0 matches (it returned a match before).
• Verified the experimental @supports block in dist/styles.css now emits two clean rules: .select, .select::picker(select) { appearance: base-select } and a single-level .select::picker(select) { box-shadow; … transition; }.

Reviewer Notes

Changes can be
tested via Pre-release

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[github-actions]

Published Pre-release for 821e607 with versions:

  - @jobber/components@7.11.4-JOB-165918-821e607.0+821e6071b

To install the new version(s) for Web run:

pnpm add @jobber/components@7.11.4-JOB-165918-821e607.0+821e6071b