Dashboard polish: bounded drag push, equal-height stats, dark featured map, sport-coloured weekly bars

- Prevent widgets flying down the page when dragging (preventCollision)
- Stat widgets fill their cell height so cards with/without sub-text align
- Featured-activity map defaults to dark tiles
- Weekly distance bars stacked and coloured by activity type, with a legend

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/ui/StatCard.jsx

@@ -9,7 +9,7 @@ const accentColors = {
 
 export default function StatCard({ label, value, accent = 'default', sub }) {
   return (
-    <div className="bg-gray-800/60 rounded-xl p-3 border border-gray-700/50">
+    <div className="bg-gray-800/60 rounded-xl p-3 border border-gray-700/50 h-full flex flex-col justify-center">
       <p className="text-xs text-gray-500 mb-1">{label}</p>
       <p className={`text-lg font-semibold ${accentColors[accent]}`}>{value}</p>
       {sub && <p className="text-xs text-gray-600 mt-0.5">{sub}</p>}

frontend/src/pages/DashboardPage.jsx

@@ -13,7 +13,7 @@ import StatCard from '../components/ui/StatCard'
 import ActivityMap from '../components/activity/ActivityMap'
 import {
   formatDuration, formatDistance, formatHeartRate, formatElevation,
-  formatDate, sportIcon, formatSleep,
+  formatDate, sportIcon, sportColor, formatSleep,
 } from '../utils/format'
 import { BB_INFERRED_COLOR, BB_INFERRED_LABEL, bbLevelColor, inferBBType } from '../utils/bodyBattery'
 
@@ -278,35 +278,62 @@ function SleepDetail({ health }) {
   )
 }
 
+const sportLabel = s => (s ? s.charAt(0).toUpperCase() + s.slice(1) : 'Other')
+
 function WeeklyChart({ activities }) {
   const navigate = useNavigate()
-  const data = useMemo(() => {
-    if (!activities?.length) return []
+  const { data, sports } = useMemo(() => {
+    if (!activities?.length) return { data: [], sports: [] }
+    // Sports present, ordered by total distance (largest stacks at the bottom).
+    const totals = {}
+    for (const a of activities) totals[a.sport_type] = (totals[a.sport_type] || 0) + (a.distance_m || 0)
+    const sports = Object.keys(totals).sort((x, y) => totals[y] - totals[x])
     const now = new Date()
     const weeks = eachWeekOfInterval({ start: subWeeks(startOfWeek(now), 7), end: startOfWeek(now) })
-    return weeks.map(weekStart => {
+    const data = weeks.map(weekStart => {
       const weekEnd = addDays(weekStart, 7)
-      const km = activities
-        .filter(a => { const t = new Date(a.start_time); return t >= weekStart && t < weekEnd })
-        .reduce((s, a) => s + (a.distance_m || 0) / 1000, 0)
-      return { week: format(weekStart, 'MMM d'), km: parseFloat(km.toFixed(2)), weekStartISO: format(weekStart, 'yyyy-MM-dd'), weekEndISO: format(weekEnd, 'yyyy-MM-dd') }
+      const row = { week: format(weekStart, 'MMM d'), weekStartISO: format(weekStart, 'yyyy-MM-dd'), weekEndISO: format(weekEnd, 'yyyy-MM-dd') }
+      for (const s of sports) row[s] = 0
+      for (const a of activities) {
+        const t = new Date(a.start_time)
+        if (t >= weekStart && t < weekEnd) row[a.sport_type] += (a.distance_m || 0) / 1000
+      }
+      for (const s of sports) row[s] = +row[s].toFixed(2)
+      return row
     })
+    return { data, sports }
   }, [activities])
 
   return (
     <Card title="Weekly distance (km)">
       {data.length ? (
-        <ResponsiveContainer width="100%" height="100%" minHeight={100}>
-          <BarChart data={data} margin={{ top: 4, right: 4, bottom: 4, left: 0 }} barSize={20}
-            onClick={e => { const p = e?.activePayload?.[0]?.payload; if (p) navigate(`/activities?from=${p.weekStartISO}&to=${p.weekEndISO}`) }}
-            style={{ cursor: 'pointer' }}>
-            <CartesianGrid strokeDasharray="3 3" stroke="#1f2937" vertical={false} />
-            <XAxis dataKey="week" tick={{ fontSize: 10, fill: '#6b7280' }} axisLine={false} tickLine={false} />
-            <YAxis tick={{ fontSize: 10, fill: '#6b7280' }} axisLine={false} tickLine={false} width={28} tickFormatter={v => `${v.toFixed(0)}`} />
-            <Tooltip contentStyle={tooltipStyle} formatter={(v) => [`${v.toFixed(1)} km`, 'Distance']} cursor={{ fill: 'rgba(59,130,246,0.1)' }} />
-            <Bar dataKey="km" fill="#3b82f6" radius={[3, 3, 0, 0]} isAnimationActive={false} />
-          </BarChart>
-        </ResponsiveContainer>
+        <div className="flex flex-col h-full">
+          <div className="flex-1 min-h-0">
+            <ResponsiveContainer width="100%" height="100%" minHeight={100}>
+              <BarChart data={data} margin={{ top: 4, right: 4, bottom: 4, left: 0 }} barSize={20}
+                onClick={e => { const p = e?.activePayload?.[0]?.payload; if (p) navigate(`/activities?from=${p.weekStartISO}&to=${p.weekEndISO}`) }}
+                style={{ cursor: 'pointer' }}>
+                <CartesianGrid strokeDasharray="3 3" stroke="#1f2937" vertical={false} />
+                <XAxis dataKey="week" tick={{ fontSize: 10, fill: '#6b7280' }} axisLine={false} tickLine={false} />
+                <YAxis tick={{ fontSize: 10, fill: '#6b7280' }} axisLine={false} tickLine={false} width={28} tickFormatter={v => `${v.toFixed(0)}`} />
+                <Tooltip contentStyle={tooltipStyle} cursor={{ fill: 'rgba(255,255,255,0.06)' }}
+                  formatter={(v, name) => [`${(+v).toFixed(1)} km`, sportLabel(name)]} />
+                {sports.map((s, i) => (
+                  <Bar key={s} dataKey={s} stackId="dist" fill={sportColor(s)} isAnimationActive={false}
+                    radius={i === sports.length - 1 ? [3, 3, 0, 0] : [0, 0, 0, 0]} />
+                ))}
+              </BarChart>
+            </ResponsiveContainer>
+          </div>
+          <div className="flex flex-wrap gap-x-3 gap-y-1 mt-2">
+            {sports.map(s => (
+              <div key={s} className="flex items-center gap-1.5">
+                <div className="w-2.5 h-2.5 rounded-sm" style={{ backgroundColor: sportColor(s) }} />
+                <span className="text-xs text-gray-400">{sportLabel(s)}</span>
+              </div>
+            ))}
+          </div>
+        </div>
       ) : (
         <div className="flex items-center justify-center h-full text-gray-600 text-sm">No activities yet</div>
       )}
@@ -333,7 +360,7 @@ function FeaturedActivity({ activity, segments }) {
       <div className="grid grid-cols-1 lg:grid-cols-3 flex-1 min-h-0">
         <div className="lg:col-span-2 min-h-[180px] bg-gray-950">
           {activity.polyline
-            ? <ActivityMap polyline={activity.polyline} sportType={activity.sport_type} colorMode="solid" />
+            ? <ActivityMap polyline={activity.polyline} sportType={activity.sport_type} colorMode="solid" mapType="dark" />
             : <div className="flex items-center justify-center h-full text-gray-600 text-sm">No GPS track</div>}
         </div>
         <div className="grid grid-cols-2 lg:grid-cols-1 gap-px bg-gray-800/50 content-start">
@@ -603,7 +630,7 @@ export default function DashboardPage() {
         isResizable={editMode}
         onLayoutChange={handleLayoutChange}
         compactType={null}
-        preventCollision={false}
+        preventCollision
         draggableCancel=".widget-delete"
       >
         {layout.filter(l => WIDGETS[l.i]).map(l => (