Update app.py

app.py

@@ -272,7 +272,7 @@ def _render_leaderboard() -> str:
                     style="margin-top:10px; background:transparent; color:#888; border:1px solid #E0DFDC; border-radius:99px; padding:2px 10px; font-size:.68rem; font-weight:600; cursor:pointer; transition: all 0.15s;"
                     onmouseover="this.style.background='#EBF3FB'; this.style.color='#0A66C2'; this.style.borderColor='#70B5F9';"
                     onmouseout="this.style.background='transparent'; this.style.color='#888'; this.style.borderColor='#E0DFDC';">
-                📸 PNG Export
+                📸 Badge Export
             </button>
             """