fix(nav): add z-index to turn labels to prevent avatar overlap

Added position: relative and zIndex: 10 to turn label text to ensure it
renders above the animated avatar emojis. The floating/scaling animations
were causing the avatars to obscure the text below them.

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

apps/web/src/components/nav/ActivePlayersList.tsx

@@ -278,6 +278,8 @@ export function ActivePlayersList({
                     letterSpacing: '0.5px',
                     textShadow: '0 2px 4px rgba(0,0,0,0.2)',
                     marginTop: '-2px',
+                    position: 'relative',
+                    zIndex: 10,
                   }}
                 >
                   Your turn

apps/web/src/components/nav/NetworkPlayerIndicator.tsx

@@ -289,6 +289,8 @@ export function NetworkPlayerIndicator({
               letterSpacing: '0.5px',
               textShadow: '0 2px 4px rgba(0,0,0,0.2)',
               marginTop: '-2px',
+              position: 'relative',
+              zIndex: 10,
             }}
           >
             Their turn