style: use CSS variable for global corner radius

[albertodainotti]

Summary

Replaces hardcoded border-radius: 3px values throughout styles.css with a new CSS custom property --notion-corner-radius: 8px.

Changes

• Added --notion-corner-radius: 8px CSS variable to the root :root scope
• Replaced 10 instances of border-radius: 3px with var(--notion-corner-radius)
• Affected elements: page icons, inline code, code blocks, bookmarks, callouts, collection cards, collection card covers, search result items, and asset wrapper icons

Motivation

This makes the corner radius consistent and easily customizable. Users can override --notion-corner-radius in their own stylesheets to adjust the global border radius across all Notion components without needing to target individual selectors.

[vercel]

@albertodainotti is attempting to deploy a commit to the Saasify Team on Vercel.

A member of the Team first needs to authorize it.

[transitive-bullshit]

these PRs are really solid. thanks, alberto 🙏