HRV: plot Garmin overnight avg (weeklyAvg) not last-night; dedupe chart tooltips

frontend/src/pages/HealthPage.jsx

@@ -547,7 +547,7 @@ function DailySnapshot({ day, snapshotWeight, avg30, intradayHr, bodyBattery, bb
               <p className="text-xs text-gray-500 mb-0.5">HRV</p>
               <div className="flex items-baseline gap-1.5 flex-wrap">
                 <span className="text-3xl font-bold text-violet-400">
-                  {day.hrv_nightly_avg ? Math.round(day.hrv_nightly_avg) : '--'}
+                  {(day.hrv_weekly_avg ?? day.hrv_nightly_avg) ? Math.round(day.hrv_weekly_avg ?? day.hrv_nightly_avg) : '--'}
                 </span>
                 <span className="text-sm text-gray-500">ms</span>
               </div>
@@ -677,6 +677,28 @@ const statusDot = (statusKey) => (props) => {
   return <circle cx={cx} cy={cy} r={3.5} fill={color} stroke="#111827" strokeWidth={1} />
 }
 
+// Custom tooltip: collapses the dashed gap-bridging Line and the solid Area
+// (same dataKey) into one row, and never shows the helper baseline band.
+function ChartTooltip({ active, payload, label, formatter }) {
+  if (!active || !payload?.length) return null
+  const seen = new Set()
+  const rows = []
+  for (const p of payload) {
+    if (p.dataKey === '__band' || p.value == null || seen.has(p.dataKey)) continue
+    seen.add(p.dataKey)
+    rows.push(p)
+  }
+  if (!rows.length) return null
+  return (
+    <div style={{ ...tooltipStyle, padding: '6px 10px' }}>
+      <div style={{ color: '#9ca3af', marginBottom: 2 }}>{format(new Date(label), 'MMM d, yyyy')}</div>
+      {rows.map(p => (
+        <div key={p.dataKey} style={{ color: '#fff' }}>{formatter ? formatter(p.value) : p.value?.toFixed(1)}</div>
+      ))}
+    </div>
+  )
+}
+
 function MetricChart({ data, dataKey, color, formatter, height = 140, selectedDate, onDayClick, connectNulls = false, showDots = false, domain, referenceLines, statusDotKey, bandLowKey, bandHighKey, bandColor = '#9ca3af' }) {
   const vals = data.filter(d => d[dataKey] != null)
   if (!vals.length) return (
@@ -713,8 +735,7 @@ function MetricChart({ data, dataKey, color, formatter, height = 140, selectedDa
           tickFormatter={d => format(new Date(d), 'MMM d')} interval="preserveStartEnd" />
         <YAxis tick={{ fontSize: 10, fill: '#6b7280' }} axisLine={false} tickLine={false} width={36}
           tickFormatter={formatter} domain={domain} />
-        <Tooltip contentStyle={tooltipStyle} labelFormatter={d => format(new Date(d), 'MMM d, yyyy')}
-          formatter={(v, name) => name === '__band' ? null : [formatter ? formatter(v) : v?.toFixed(1)]} />
+        <Tooltip content={<ChartTooltip formatter={formatter} />} />
         {hasBand && (
           <Area type="monotone" dataKey="__band" stroke="none" fill={bandColor} fillOpacity={0.18}
             connectNulls isAnimationActive={false} legendType="none" activeDot={false} />
@@ -1063,14 +1084,14 @@ export default function HealthPage() {
 
             <div className="bg-gray-900 rounded-xl border border-gray-800 p-4">
               <div className="flex items-center justify-between mb-3">
-                <h3 className="text-sm font-medium text-gray-300">HRV (nightly avg)</h3>
+                <h3 className="text-sm font-medium text-gray-300">HRV (overnight avg)</h3>
                 <div className="flex items-center gap-3 text-xs text-gray-500">
                   <span className="flex items-center gap-1"><span className="w-2 h-2 rounded-full" style={{ background: '#22c55e' }} /> Balanced</span>
                   <span className="flex items-center gap-1"><span className="w-2 h-2 rounded-full" style={{ background: '#f97316' }} /> Unbalanced</span>
                   <span className="flex items-center gap-1"><span className="w-3 h-2 rounded-sm" style={{ background: '#9ca3af', opacity: 0.5 }} /> Baseline</span>
                 </div>
               </div>
-              <MetricChart data={metrics} dataKey="hrv_nightly_avg" color="#8b5cf6"
+              <MetricChart data={metrics} dataKey="hrv_weekly_avg" color="#8b5cf6"
                 formatter={v => `${Math.round(v)} ms`}
                 selectedDate={selDateForCharts} onDayClick={handleDayClick}
                 statusDotKey="hrv_status"