feat: render sparklines + wire trend-chart pill toggle (#6)

views/partials/ratings-table.ejs

@@ -1,3 +1,33 @@
+<%
+function renderSparkline(values) {
+    if (!values || values.length < 2) return '';
+    var w = 96, h = 28;
+    var min = Math.min.apply(null, values);
+    var max = Math.max.apply(null, values);
+    var range = max - min || 1;
+    var xStep = w / (values.length - 1);
+
+    var pts = values.map(function(v, i) {
+        return {
+            x: (i * xStep).toFixed(1),
+            y: (((max - v) / range) * (h - 4) + 2).toFixed(1)
+        };
+    });
+
+    var linePath = pts.map(function(p, i) {
+        return (i === 0 ? 'M' : 'L') + ' ' + p.x + ' ' + p.y;
+    }).join(' ');
+
+    var last = pts[pts.length - 1];
+    var areaPath = linePath + ' L ' + last.x + ' ' + h + ' L 0 ' + h + ' Z';
+
+    return '<svg width="' + w + '" height="' + h + '" viewBox="0 0 ' + w + ' ' + h + '" style="display:block;overflow:visible">' +
+        '<path d="' + areaPath + '" style="fill:var(--accent);fill-opacity:0.10"/>' +
+        '<path d="' + linePath + '" style="stroke:var(--accent);stroke-width:1.5;fill:none;stroke-linejoin:round;stroke-linecap:round"/>' +
+        '<circle cx="' + last.x + '" cy="' + last.y + '" r="2.5" style="fill:var(--accent)"/>' +
+        '</svg>';
+}
+%>
 <% if (ratings.length === 0) { %>
     <p style="text-align: center; color: var(--text-muted); padding: 40px 0;">No ratings found.</p>
 <% } else { %>
@@ -20,6 +50,8 @@
                 var deltaPredicted = player.deltaPredicted ?? null;
                 var deltaPredictedPillText = deltaPredicted != null ? (deltaPredicted > 0 ? '+' + deltaPredicted : deltaPredicted.toString()) : null;
                 var deltaPredictedPillClass = deltaPredicted > 0 ? 'up' : deltaPredicted < 0 ? 'down' : 'flat';
+
+                var sparklineSvg = renderSparkline(player.monthlyHistory || []);
             %>
             <tr id="row-<%= player.pdgaNumber %>" class="expandable-row" onclick="togglePlayerHistory(<%= player.pdgaNumber %>)">
                 <td class="mobile-hide"><%= index + 1 %></td>
@@ -36,6 +68,9 @@
                     <% if (ratingChangePillText) { %>
                     <span class="delta-pill <%= ratingChangePillClass %>"><%= ratingChangePillText %></span>
                     <% } %>
+                    <% if (sparklineSvg) { %>
+                    <span class="sparkline"><%- sparklineSvg %></span>
+                    <% } %>
                     <div class="std-dev-tooltip" id="tooltip-rating-<%= player.pdgaNumber %>"></div>
                 </td>
                 <td class="predicted-rating mobile-hide" id="predicted-<%= player.pdgaNumber %>">