feat: introduce alpha-based overlay tokens, remove overlay-base-primary

[rohanchkrabrty]

Summary

• Add 12-step --rs-alpha-aN primitives (theme-aware: black in light, white in dark) and expose them via --rs-color-overlay-base-aN.
• Normalize --rs-color-overlay-black-aN and --rs-color-overlay-white-aN alpha values to clean steps (e.g. 0.051 → 0.05, 0.302 → 0.3) per updated Figma tokens.
• Remove --rs-color-overlay-base-primary; migrate Dialog, Drawer, Command backdrops and the ScrollArea thumb to the new variables.
• Document the breaking change and replacement variables in docs/V1-migration.md.
• Update token reference page in the docs site to list the new overlay-base-aN family.

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Project	Deployment	Actions	Updated (UTC)
apsara	Ready	Preview, Comment	May 4, 2026 10:13pm

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 650b92eb-e763-4b7f-9cdd-92eb17cc930b

📥 Commits

Reviewing files that changed from the base of the PR and between 3017349 and dec7807.

📒 Files selected for processing (8)

• apps/www/src/content/docs/theme/colors/index.mdx
• docs/V1-migration.md
• packages/raystack/components/command/command.module.css
• packages/raystack/components/dialog/dialog.module.css
• packages/raystack/components/drawer/drawer.module.css
• packages/raystack/components/scroll-area/scroll-area.module.css
• packages/raystack/styles/colors.css
• packages/raystack/styles/primitives/appearance.css

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