Leaderboard: single period note at top ('last 30 days'); rows just request counts

app/main.py

@@ -338,6 +338,7 @@ PAGE_HTML = """<!DOCTYPE html>
   .docs-link:hover { text-decoration: underline; }
 
   /* Leaderboard */
+  .board-note { color: var(--muted); font-size: 12px; margin-bottom: 10px; }
   .board-row {
     display: flex; align-items: flex-start; gap: 14px;
     padding: 12px 0; border-top: 1px solid #f0ede6;
@@ -508,6 +509,7 @@ PAGE_HTML = """<!DOCTYPE html>
     </div>
 
     <div id="view-coop" style="display:none;">
+      <div class="board-note">Usage across the co-op, last 30 days</div>
       <div class="board" id="coop-board"></div>
     </div>
 
@@ -642,7 +644,7 @@ function renderBoard(models) {
           '<div class="board-cost">' + fmtMoney(m.spend || 0) + ' total</div>' +
         '</div>' +
         '<div class="board-bar"><div class="board-fill" style="width:' + pct + '%"></div></div>' +
-        '<div class="board-sub">' + req.toLocaleString() + ' requests by members · last 30 days</div>' +
+        '<div class="board-sub">' + req.toLocaleString() + ' requests</div>' +
       '</div>' +
       '</div>';
   }).join('');