fix(know-your-world): use viewport-based maxHeight for right panel

- Change from fixed 550px to calc(100vh - 200px) for maxHeight
- Ensures assistance level selector is visible on all screen sizes
- The inline region list on larger screens was pushing content out of view

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

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

apps/web/src/arcade-games/know-your-world/components/DrillDownMapSelector.tsx

@@ -1340,7 +1340,7 @@ export function DrillDownMapSelector({
               rounded: 'xl',
               shadow: 'lg',
               width: '205px',
-              maxHeight: { base: 'none', md: fillContainer ? '550px' : 'none' },
+              maxHeight: { base: 'none', md: fillContainer ? 'calc(100vh - 200px)' : 'none' },
               overflowY: 'auto',
             })}
           >