feat(memory-quiz): show player emojis on cards to indicate who found them

Replace checkmark indicators with player emojis on correctly guessed cards
in the results view. This provides visual feedback about which team found
each number in both cooperative and competitive modes.

- Display team player emojis vertically stacked for multi-player teams
- Use rounded rectangle background instead of circle for better fit
- Set maxHeight and overflow:hidden to prevent clipping issues
- Fallback to checkmark if no player data available

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

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

apps/web/src/app/arcade/memory-quiz/components/ResultsCardGrid.tsx

@@ -147,26 +147,61 @@ export function ResultsCardGrid({ state }: ResultsCardGridProps) {
                     </div>
                   </div>
 
-                  {/* Right/Wrong indicator overlay */}
+                  {/* Player indicator overlay */}
                   <div
                     style={{
                       position: 'absolute',
                       top: '4px',
                       right: '4px',
-                      width: '20px',
-                      height: '20px',
-                      borderRadius: '50%',
+                      minWidth: wasFound ? '24px' : '20px',
+                      minHeight: '20px',
+                      maxHeight: '48px',
+                      borderRadius: wasFound ? '8px' : '50%',
                       background: wasFound ? '#10b981' : '#ef4444',
                       color: 'white',
                       display: 'flex',
+                      flexDirection: 'column',
                       alignItems: 'center',
                       justifyContent: 'center',
-                      fontSize: '12px',
+                      fontSize: wasFound ? '14px' : '12px',
                       fontWeight: 'bold',
                       boxShadow: '0 1px 2px rgba(0, 0, 0, 0.2)',
+                      padding: wasFound ? '2px' : '0',
+                      gap: '1px',
+                      overflow: 'hidden',
                     }}
                   >
-                    {wasFound ? '✓' : '✗'}
+                    {wasFound
+                      ? (() => {
+                          // Get the userId who found this number
+                          const foundByUserId = state.numberFoundBy?.[card.number]
+                          if (!foundByUserId) return '✓'
+
+                          // Get all players on that team
+                          const teamPlayers = state.activePlayers
+                            ?.filter((playerId) => {
+                              const metadata = state.playerMetadata?.[playerId]
+                              return metadata?.userId === foundByUserId
+                            })
+                            .map((playerId) => state.playerMetadata?.[playerId])
+                            .filter(Boolean)
+
+                          if (!teamPlayers || teamPlayers.length === 0) return '✓'
+
+                          // Display emojis (stacked vertically if multiple)
+                          return teamPlayers.map((player, idx) => (
+                            <span
+                              key={idx}
+                              style={{
+                                lineHeight: '1',
+                                fontSize: '14px',
+                              }}
+                            >
+                              {player?.emoji || '🎮'}
+                            </span>
+                          ))
+                        })()
+                      : '✗'}
                   </div>
 
                   {/* Number label overlay */}