fix(docs): align preview colors with Blume themes

[thebuilder]

Summary

• align the landing page install block and screenshot frames with Blume's semantic theme tokens
• use the shared code surface, foreground, border, and muted header colors in light and dark mode
• replace the screenshot header's grey color mix with inherited muted text color and opacity

Verification

• pnpm docs:check
• pnpm docs:validate
• pnpm docs:build
• verified the landing page in Browser in light and dark mode with no console warnings or errors

The docs commands retain existing offline warnings for the GitHub changelog source, Google font metadata, and validation of content-managed screenshot paths.

[vercel]

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Project	Deployment	Actions	Updated
web-analytics	Ready	Preview	Sep 2, 2026 9:44am UTC