feat(selector): add ghost variant

[cixzhang]

Summary

Replaces #3980 which proposes to add selection to dropdown menus. The goal was to have a selector with ghost appearance, so adding the ghost variant here instead.

Adds variant="ghost" to Selector and MultiSelector so picker-style controls can sit visually alongside ghost buttons in toolbar rows. The existing bordered form-control treatment is now named variant="input" and remains the default.

What changed

• Adds a borderless, button-like ghost trigger treatment with matching hover, pressed, focus, disabled, and auto-width behavior.
• Reflects variant="input" | "ghost" on the theme target surface for both selector components.
• Treats attached status as invalid for ghost triggers by detaching it by default; compact toolbar examples use statusVariant="tooltip" when status feedback needs to stay inline.
• Adds Storybook coverage, doc metadata/guidance, CLI/docsite example blocks, and a changeset.

Testing

• vitest run packages/core/src/Selector/Selector.test.tsx packages/core/src/MultiSelector/MultiSelector.test.tsx
• pnpm -F @astryxdesign/core typecheck
• eslint on changed implementation, test, story, and example files
• node scripts/check-sync.js
• node scripts/check-changesets.mjs
• git diff --check
• node apps/docsite/scripts/generate-data.mjs (succeeded; fresh-worktree warnings only for unbuilt theme package outputs)

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Project	Deployment	Actions	Updated (UTC)
astryx	Ready	Preview	Aug 4, 2026 8:10pm

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PR Analysis Report

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Modified Components

MultiSelector _{(@astryxdesign/core)} · View in Storybook

Metric	Before	After	Delta
Bundle Size (ESM)	N/A	N/A	N/A
Lines of Code	N/A	1448	-
Complexity	N/A	Very High (177)	-

Selector _{(@astryxdesign/core)} · View in Storybook

Metric	Before	After	Delta
Bundle Size (ESM)	N/A	N/A	N/A
Lines of Code	N/A	1431	-
Complexity	N/A	Very High (138)	-

Bundle Size Summary

Package	Size (ESM)	Size (CJS)	Gzipped
@astryxdesign/core	N/A	4.9KB	1.3KB

Accessibility Audit

Status: No accessibility violations detected.

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_{Generated by PR Enrichment workflow | Storybook | Sandbox | View full report}