feat: stacked area chart, framework breakdown on active sessions, tool bar visualization

cmd/web-ui/static/app.js

@@ -943,6 +943,7 @@
         <div class="summary-card">
           <div class="summary-card-label">Active Sessions</div>
           <div class="summary-card-value" id="dash-active">-</div>
+          <div class="summary-card-sub" id="dash-active-sub"></div>
         </div>
         <div class="summary-card">
           <div class="summary-card-label">Runs Today</div>
@@ -1133,6 +1134,14 @@
     if (errEl) {
       errEl.classList.toggle('has-errors', s.errors_today > 0);
     }
+
+    const subEl = document.getElementById('dash-active-sub');
+    if (subEl && s.by_framework) {
+      const parts = Object.entries(s.by_framework)
+        .filter(([, v]) => v.runs > 0)
+        .map(([name, v]) => escapeHTML(name) + ' ' + v.runs);
+      subEl.textContent = parts.length > 0 ? parts.join(' / ') : '';
+    }
   }
 
   async function loadTimeseries() {
@@ -1154,11 +1163,15 @@
   function buildChartData() {
     const ts = dashboardState.timeseries;
     if (!ts || !ts.series || ts.series.length === 0) return null;
+    // Stacked: errors on bottom, then tools, then runs on top
+    const errors = ts.series.map(b => b.errors);
+    const tools = ts.series.map((b, i) => b.tools + errors[i]);
+    const runs = ts.series.map((b, i) => b.runs + tools[i]);
     return [
       ts.series.map(b => Math.floor(new Date(b.ts).getTime() / 1000)),
-      ts.series.map(b => b.runs),
-      ts.series.map(b => b.tools),
-      ts.series.map(b => b.errors),
+      runs,
+      tools,
+      errors,
     ];
   }
 
@@ -1211,22 +1224,26 @@
         {
           label: 'Runs',
           stroke: '#34d399',
-          width: 2,
-          fill: 'rgba(52, 211, 153, 0.08)',
+          width: 1.5,
+          fill: 'rgba(52, 211, 153, 0.15)',
         },
         {
           label: 'Tools',
           stroke: '#22d3ee',
-          width: 2,
-          fill: 'rgba(34, 211, 238, 0.08)',
+          width: 1.5,
+          fill: 'rgba(34, 211, 238, 0.15)',
         },
         {
           label: 'Errors',
           stroke: '#f87171',
-          width: 2,
-          fill: 'rgba(248, 113, 113, 0.08)',
+          width: 1.5,
+          fill: 'rgba(248, 113, 113, 0.2)',
         },
       ],
+      bands: [
+        { series: [1, 2], fill: 'rgba(52, 211, 153, 0.15)' },
+        { series: [2, 3], fill: 'rgba(34, 211, 238, 0.15)' },
+      ],
     };
 
     dashboardChart = new uPlot(opts, data, container);
@@ -1354,12 +1371,21 @@
       return;
     }
 
-    list.innerHTML = topTools.map(([name, count]) => `
-      <li>
-        <span class="stat-list-name">${escapeHTML(name)}</span>
-        <span class="stat-list-count">${count}</span>
-      </li>
-    `).join('');
+    const maxCount = topTools[0][1];
+    list.innerHTML = topTools.map(([name, count]) => {
+      const pct = maxCount > 0 ? (count / maxCount * 100) : 0;
+      return `
+        <li>
+          <div class="stat-list-header">
+            <span class="stat-list-name">${escapeHTML(name)}</span>
+            <span class="stat-list-count">${count}</span>
+          </div>
+          <div class="stat-list-bar-track">
+            <div class="stat-list-bar-fill" style="width:${pct}%"></div>
+          </div>
+        </li>
+      `;
+    }).join('');
   }
 
   route();

cmd/web-ui/static/style.css

@@ -889,6 +889,27 @@ tr.clickable:hover td:first-child {
   border-radius: 4px;
 }
 
+.stat-list-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.stat-list-bar-track {
+  height: 3px;
+  background: var(--surface-2);
+  border-radius: 2px;
+  margin-top: 0.3rem;
+  overflow: hidden;
+}
+
+.stat-list-bar-fill {
+  height: 100%;
+  background: var(--accent);
+  border-radius: 2px;
+  transition: width 0.3s ease;
+}
+
 .event-icon {
   width: 18px;
   height: 18px;