feat(web): integrate crop stress into Pulse page

- index() route: add get_weather_stress_latest() and get_weather_stress_trend(90d)
  to asyncio.gather; pass weather_stress_latest and weather_stress_trend to template
- pulse.html: add 5th metric card (Crop Stress Index, color-coded green/copper/danger)
- pulse.html: add 5th sparkline card (90d avg stress trend) linking to /dashboard/weather
- pulse.html: update spark-grid to auto-fit (minmax 280px) to accommodate 5 cards
- pulse.html: add Weather freshness badge to the freshness bar

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/beanflows/dashboard/templates/pulse.html

@@ -25,16 +25,13 @@
   color: var(--color-stone);
 }
 
-/* 2×2 sparkline grid */
+/* Sparkline grid — auto-fit for 4 or 5 cards */
 .spark-grid {
   display: grid;
-  grid-template-columns: 1fr 1fr;
+  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
   gap: 1rem;
   margin-top: 1.5rem;
 }
-@media (max-width: 600px) {
-  .spark-grid { grid-template-columns: 1fr; }
-}
 
 .spark-card {
   background: white;
@@ -94,7 +91,7 @@
   <p>Global coffee market — full picture in 10 seconds{% if user.name %} · Welcome back, {{ user.name }}{% endif %}</p>
 </div>
 
-<!-- 4 metric cards -->
+<!-- Metric cards -->
 <div class="grid-4 mb-6 pulse-in">
   <div class="metric-card">
     <div class="metric-label">KC=F Close</div>
@@ -139,6 +136,17 @@
     </div>
     <div class="metric-sub">ending stocks / consumption{% if stu_latest %} · {{ stu_latest.market_year }}{% endif %}</div>
   </div>
+
+  <div class="metric-card">
+    <div class="metric-label">Crop Stress Index</div>
+    <div class="metric-value {% if weather_stress_latest and weather_stress_latest.avg_crop_stress_index > 40 %}text-danger{% elif weather_stress_latest and weather_stress_latest.avg_crop_stress_index > 20 %}text-copper{% else %}text-bean-green{% endif %}">
+      {% if weather_stress_latest %}{{ "{:.0f}".format(weather_stress_latest.avg_crop_stress_index) }}/100{% else %}--{% endif %}
+    </div>
+    <div class="metric-sub">
+      avg · {% if weather_stress_latest %}{{ weather_stress_latest.locations_under_stress }} stressed{% endif %}
+      {% if weather_stress_latest %} · {{ weather_stress_latest.observation_date }}{% endif %}
+    </div>
+  </div>
 </div>
 
 <!-- Freshness bar -->
@@ -156,6 +164,9 @@
   <a href="{{ url_for('public.methodology') }}" class="freshness-badge">
     <strong>ICE Stocks</strong> {% if ice_stocks_latest %}{{ ice_stocks_latest.report_date }}{% else %}—{% endif %}
   </a>
+  <a href="{{ url_for('dashboard.weather') }}" class="freshness-badge">
+    <strong>Weather</strong> {% if weather_stress_latest %}{{ weather_stress_latest.observation_date }}{% else %}—{% endif %}
+  </a>
 </div>
 
 <!-- 2×2 sparkline grid -->
@@ -209,6 +220,18 @@
     <div class="spark-meta">USDA WASDE · 1,000 60-kg bags · production vs distribution</div>
   </div>
 
+  <!-- Weather Crop Stress 90d -->
+  <div class="spark-card">
+    <div class="spark-card-head">
+      <div class="spark-title">Crop Stress Index — 90 days</div>
+      <a href="{{ url_for('dashboard.weather') }}" class="spark-detail-link">View details →</a>
+    </div>
+    <div class="spark-chart-wrap">
+      <canvas id="sparkWeather"></canvas>
+    </div>
+    <div class="spark-meta">Open-Meteo ERA5 · avg across 12 origins · 0 = no stress · 100 = severe</div>
+  </div>
+
 </div>
 
 {% if plan == "free" %}
@@ -338,6 +361,27 @@
       options: sparkOpts(C.copper, false),
     });
   }
+
+  // Weather crop stress sparkline (90d)
+  var weatherRaw = {{ weather_stress_trend | tojson }};
+  if (weatherRaw && weatherRaw.length > 0) {
+    var weatherAsc = weatherRaw.slice().reverse();
+    new Chart(document.getElementById('sparkWeather'), {
+      type: 'line',
+      data: {
+        labels: weatherAsc.map(function (r) { return r.observation_date; }),
+        datasets: [{
+          data: weatherAsc.map(function (r) { return r.avg_crop_stress_index; }),
+          borderColor: C.copper,
+          backgroundColor: C.copper + '22',
+          fill: true,
+          tension: 0.3,
+          borderWidth: 2,
+        }],
+      },
+      options: sparkOpts(C.copper, true),
+    });
+  }
 }());
 </script>
 {% endblock %}