fix(card-sorting): increase card tile sizes to contain abacuses

Make card tiles larger to properly contain AbacusReact SVGs without overflow.

**Issue:**
Card tiles were too small (90px × 90px and 90px × 110px) to contain the
AbacusReact SVGs, causing abacuses to overflow their containers.

**Fix:**
- **Available cards**: Increased from 90px × 90px to 140px × 140px
- **Position slots**: Increased from 90px × 110px to 140px × 160px

**Result:**
Abacus SVGs now fit comfortably within their card containers without
overflowing, while maintaining the overflow: hidden constraint as a
safety measure.

src/arcade-games/card-sorting/components/PlayingPhase.tsx:283-284,419-420

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

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

apps/web/src/arcade-games/card-sorting/components/PlayingPhase.tsx

@@ -280,8 +280,8 @@ export function PlayingPhase() {
                 key={card.id}
                 onClick={() => handleCardClick(card.id)}
                 className={css({
-                  width: '90px',
-                  height: '90px',
+                  width: '140px',
+                  height: '140px',
                   padding: '8px',
                   border: '2px solid',
                   borderColor: selectedCardId === card.id ? '#1976d2' : 'transparent',
@@ -416,8 +416,8 @@ export function PlayingPhase() {
                     key={`slot-${index}`}
                     onClick={() => handleSlotClick(index)}
                     className={css({
-                      width: '90px',
-                      height: '110px',
+                      width: '140px',
+                      height: '160px',
                       padding: '0.5rem',
                       borderRadius: '8px',
                       border: '2px solid',