feat(Banner): expose root theme target

[freddymeta]

Closes #6006.

Summary

• add astryx-banner-root to the existing outer Banner element
• reflect container and elevation on that target for scoped theme rules
• document and generate probe coverage while preserving every existing target and default style
• record the component's verified RTL non-applicability for the current anatomy

This lets themes set the outer boxShadow and borderRadius directly instead of relying on Banner's DOM structure.

Validation

• pnpm lint:strict
• pnpm exec vitest run --maxWorkers=4
• pnpm build
• pnpm -F @astryxdesign/core typecheck
• pnpm storybook:build
• pnpm a11y:audit -- --components Banner
• pnpm rtl:audit -- --filter Banner
• pnpm visual:probe-theme:check
• node .github/scripts/visual-gate/gate.mjs reach --only core-banner — 8 targets reached, 0 missed

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Project	Deployment	Actions	Updated
astryx	Ready	Preview	Sep 4, 2026 6:13am UTC

[github-actions]

PR Analysis Report

Preview availability: Storybook and Sandbox were not published for this CI run.

Modified Components

Banner _{(@astryxdesign/core)}

Metric	Before	After	Delta
Bundle Size (ESM)	N/A	N/A	N/A
Lines of Code	N/A	428	-
Complexity	N/A	Very High (44)	-

Bundle Size Summary

Package	Size (ESM)	Size (CJS)	Gzipped
@astryxdesign/core	N/A	4.8KB	1.2KB

Accessibility Audit

Status: No accessibility violations detected.

Visual Regression

Status: No visual change across 2 compared shot(s).

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