fix(homepage): increase abacus container width to 120px/150px

Increase abacus container width from 95px/110px to 120px (mobile) and
150px (desktop) to properly accommodate 3-column abacus visualizations
without clipping.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/web/src/app/page.tsx

@@ -274,7 +274,7 @@ export default function HomePage() {
                               <div
                                 className={css({
                                   fontSize: '3xl',
-                                  width: { base: '95px', lg: '110px' },
+                                  width: { base: '120px', lg: '150px' },
                                   minHeight: { base: '115px', lg: '140px' },
                                   display: 'flex',
                                   alignItems: 'center',