Sort metrics numerically on the CCP Metrics page

Add a natural-sort comparator for metric IDs (e.g. 2.3.6i, 5.2.6, 10.1.1)
and apply it to the metric breakdown cards, the vertical detail table, and
the forecast burndown metric dropdown. Metrics now appear in ascending
numerical order instead of arbitrary API response order.

Closes #24

frontend/src/components/pages/CCPMetricsPage.js

@@ -8,6 +8,26 @@ const API_BASE = process.env.REACT_APP_API_BASE || 'http://localhost:3001/api';
 const TEAL = '#14B8A6';
 const PURPLE = '#A78BFA';
 
+// Natural sort comparator for metric IDs like "2.3.6i", "5.2.6", "10.1.1".
+// Splits on "." and compares each segment numerically (trailing letters after digits sort after pure numbers).
+function compareMetricIds(a, b) {
+    const partsA = a.split('.');
+    const partsB = b.split('.');
+    const len = Math.max(partsA.length, partsB.length);
+    for (let i = 0; i < len; i++) {
+        const segA = partsA[i] || '';
+        const segB = partsB[i] || '';
+        const numA = parseFloat(segA) || 0;
+        const numB = parseFloat(segB) || 0;
+        if (numA !== numB) return numA - numB;
+        // Same numeric prefix — compare the suffix (e.g. "6i" vs "6")
+        const suffA = segA.replace(/^[\d.]+/, '');
+        const suffB = segB.replace(/^[\d.]+/, '');
+        if (suffA !== suffB) return suffA.localeCompare(suffB);
+    }
+    return 0;
+}
+
 // ---------------------------------------------------------------------------
 // Styles
 // ---------------------------------------------------------------------------
@@ -106,7 +126,8 @@ function MetricBreakdownPanel({ metrics }) {
     if (!metrics || metrics.length === 0) return null;
 
     // Only show metrics with non_compliant > 0
-    const ncMetrics = metrics.filter(m => m.non_compliant > 0);
+    const ncMetrics = metrics.filter(m => m.non_compliant > 0)
+        .sort((a, b) => compareMetricIds(a.metric_id, b.metric_id));
     if (ncMetrics.length === 0) return null;
 
     const TOP_COUNT = 8;
@@ -628,9 +649,10 @@ function VerticalDetailView({ vertical, onBack, onSelectMetric }) {
     if (loading) return <div style={{ padding: '2rem', textAlign: 'center', color: '#64748B' }}><Loader style={{ animation: 'spin 1s linear infinite' }} /> Loading...</div>;
 
     // Filter metrics by team if a team filter is active
-    const displayMetrics = teamFilter
+    const displayMetrics = (teamFilter
         ? metrics.filter(m => m.sub_teams && m.sub_teams.some(st => st.team === teamFilter))
-        : metrics;
+        : metrics
+    ).slice().sort((a, b) => compareMetricIds(a.metric_id, b.metric_id));
 
     return (
         <div>
@@ -1282,7 +1304,7 @@ function MetricSelector({ onMetricSelect, selectedMetric }) {
                     minWidth: '200px',
                 }}
             >
-                {metrics.map(m => (
+                {metrics.slice().sort((a, b) => compareMetricIds(a.metric_id, b.metric_id)).map(m => (
                     <option key={m.metric_id} value={m.metric_id}>
                         {m.metric_id} — {m.device_count} device{m.device_count !== 1 ? 's' : ''}
                     </option>