refactor: update fitness dashboard integration and terminology

- Changed the fitness overview path from `/activity` to `/history` and updated related navigation labels to reflect this change.
- Refactored the `FitnessDashboardOverview` component to accept external period control and conditionally display the period selector.
- Integrated the `FitnessDashboardOverview` into the `History` page, enhancing the user experience with consistent terminology and layout.
- Removed the fitness overview from the `ActivityPage` to streamline the interface and focus on activity data collection.

docs/issues/issue-fitness-dashboard-layer2b.md

@@ -8,7 +8,7 @@
 
 ## Ziel
 
-- Eine **Fitness-Übersicht** auf `/activity` (Capture-Hub: „Fitness“), die **keine parallelen Berechnungen** im Client führt.
+- Eine **Fitness-Übersicht** auf **`/history`** (Tab Fitness), analog Körper/Ernährung — **keine parallelen Berechnungen** im Client für Layer 2b.
 - **Single Source of Truth:** `data_layer/activity_metrics` (und Scores/Focus wie bei den Platzhaltern), identische Chart-Payloads wie die bestehenden Chart-Endpunkte A1/A2.
 
 ---
@@ -35,8 +35,8 @@
 |-------------|------|
 | API-Client | `getFitnessDashboardViz(days)` in `frontend/src/utils/api.js` |
 | Darstellung | `frontend/src/components/FitnessDashboardOverview.jsx` |
-| Einbindung | `frontend/src/pages/ActivityPage.jsx` (oben, vor Tabs) |
-| Navigation Capture | `frontend/src/config/captureNav.js` – Label **Fitness**, Route `/activity` |
+| Einbindung | `frontend/src/pages/History.jsx` → `ActivitySection` (gemeinsamer `PeriodSelector` wie die Liste darunter) |
+| Erfassung | `/activity` bleibt reine Erfassung; Capture-Hub-Label **Aktivität** |
 
 ---
 

frontend/src/components/FitnessDashboardOverview.jsx

@@ -22,9 +22,20 @@ const PERIODS = [
 
 /**
  * Layer 2b: Kennzahlen und Charts nur aus GET /api/charts/fitness-dashboard-viz (activity_metrics).
+ *
+ * @param {number} [period] – gesteuert von außen (z. B. Verlauf `PeriodSelector`); mit `onPeriodChange` koppeln.
+ * @param {(n: number) => void} [onPeriodChange]
+ * @param {boolean} [hidePeriodSelector] – eigenes Zeitraum-Dropdown ausblenden (wenn die Seite oben schon einen Zeitraum wählt).
  */
-export default function FitnessDashboardOverview() {
-  const [period, setPeriod] = useState(28)
+export default function FitnessDashboardOverview({
+  period: periodProp,
+  onPeriodChange,
+  hidePeriodSelector = false,
+}) {
+  const [internalPeriod, setInternalPeriod] = useState(28)
+  const controlled = periodProp !== undefined && typeof onPeriodChange === 'function'
+  const period = controlled ? periodProp : internalPeriod
+  const setPeriod = controlled ? onPeriodChange : setInternalPeriod
   const [viz, setViz] = useState(null)
   const [loading, setLoading] = useState(true)
   const [err, setErr] = useState(null)
@@ -104,11 +115,16 @@ export default function FitnessDashboardOverview() {
   const wUsed = viz.training_volume_weeks_used
   const dTyp = viz.training_type_dist_days_used
 
+  const showPeriodDropdown = !hidePeriodSelector && !controlled
+
   return (
     <div className="card section-gap">
       <div className="card-title" style={{ display: 'flex', flexWrap: 'wrap', alignItems: 'center', gap: 12 }}>
         <span>Fitness-Übersicht</span>
-        <label style={{ fontSize: 12, fontWeight: 500, color: 'var(--text3)', display: 'flex', alignItems: 'center', gap: 8 }}>
+        {showPeriodDropdown ? (
+          <label
+            style={{ fontSize: 12, fontWeight: 500, color: 'var(--text3)', display: 'flex', alignItems: 'center', gap: 8 }}
+          >
             Zeitraum
             <select
               className="form-input"
@@ -123,6 +139,7 @@ export default function FitnessDashboardOverview() {
               ))}
             </select>
           </label>
+        ) : null}
       </div>
 
       <p style={{ fontSize: 11, color: 'var(--text3)', lineHeight: 1.45, marginBottom: 10 }}>

frontend/src/config/captureNav.js

@@ -56,7 +56,7 @@ export const CAPTURE_HUB_TILES = [
   },
   {
     icon: '🏋️',
-    label: 'Fitness',
+    label: 'Aktivität',
     sub: 'Training manuell oder Apple Health importieren',
     to: '/activity',
     color: '#D4537E',

frontend/src/pages/ActivityPage.jsx

@@ -3,7 +3,6 @@ import { Upload, Pencil, Trash2, Check, X, CheckCircle } from 'lucide-react'
 import { BarChart, Bar, XAxis, YAxis, Tooltip, ResponsiveContainer, CartesianGrid } from 'recharts'
 import { api } from '../utils/api'
 import UsageBadge from '../components/UsageBadge'
-import FitnessDashboardOverview from '../components/FitnessDashboardOverview'
 import TrainingTypeSelect from '../components/TrainingTypeSelect'
 import BulkCategorize from '../components/BulkCategorize'
 import dayjs from 'dayjs'
@@ -913,12 +912,7 @@ export default function ActivityPage() {
 
   return (
     <div className="capture-page">
-      <h1 className="page-title">Fitness</h1>
-      <p style={{ fontSize: 12, color: 'var(--text3)', marginTop: -8, marginBottom: 12 }}>
-        Auswertung (Data-Layer) und Erfassung an einem Ort.
-      </p>
-
-      <FitnessDashboardOverview />
+      <h1 className="page-title">Aktivität</h1>
 
       <div className="tabs" style={{overflowX:'auto',flexWrap:'nowrap'}}>
         <button className={'tab'+(tab==='list'?' active':'')} onClick={()=>setTab('list')}>Verlauf</button>

frontend/src/pages/History.jsx

@@ -14,6 +14,7 @@ import { getStatusColor, getStatusBg } from '../utils/interpret'
 import { MACRO_CHART, macroFillByName, NUTRITION_MACRO_CHART_BLOCK_PX } from '../utils/macroChartTheme'
 import Markdown from '../utils/Markdown'
 import TrainingTypeDistribution from '../components/TrainingTypeDistribution'
+import FitnessDashboardOverview from '../components/FitnessDashboardOverview'
 import NutritionCharts, { WeeklyMacroDistributionPanel } from '../components/NutritionCharts'
 import RecoveryCharts from '../components/RecoveryCharts'
 import KpiTilesOverview from '../components/KpiTilesOverview'
@@ -1097,16 +1098,14 @@ function NutritionSection({ profile, insights, onRequest, loadingSlug, filterAct
   )
 }
 
-// ── Activity Section ──────────────────────────────────────────────────────────
+// ── Activity Section — Layer 2b Fitness-Bundle wie Körper/Ernährung auf /history ─
 function ActivitySection({ activities, insights, onRequest, loadingSlug, filterActiveSlugs, globalQualityLevel }) {
   const [period, setPeriod] = useState(30)
-  if (!activities?.length) return (
-    <EmptySection text="Noch keine Aktivitätsdaten." to="/activity" toLabel="Fitness erfassen"/>
-  )
   const cutoff = dayjs().subtract(period,'day').format('YYYY-MM-DD')
 
   // Issue #31: Backend already filters by global quality level - only filter by period here
-  const filtA = activities.filter(d => period === 9999 || d.date >= cutoff)
+  const actList = activities || []
+  const filtA = actList.filter(d => period === 9999 || d.date >= cutoff)
 
   const byDate={}
   filtA.forEach(a=>{ byDate[a.date]=(byDate[a.date]||0)+(a.kcal_active||0) })
@@ -1130,13 +1129,24 @@ function ActivitySection({ activities, insights, onRequest, loadingSlug, filterA
     value:consistency+'%'
   }]
 
+  const hasList = actList.length > 0
+
   return (
     <div>
-      <SectionHeader title="🏋️ Fitness" to="/activity" toLabel="Alle Einträge" lastUpdated={activities[0]?.date}/>
+      <SectionHeader title="🏋️ Fitness" to="/activity" toLabel="Alle Einträge" lastUpdated={actList[0]?.date}/>
       <PeriodSelector value={period} onChange={setPeriod}/>
+      <p style={{ fontSize: 11, color: 'var(--text3)', lineHeight: 1.45, marginBottom: 10 }}>
+        Fitness-Kennzahlen und Diagramme (Layer 2b) kommen aus dem Aktivitäts-Data-Layer — dieselbe Quelle wie die
+        KI-Platzhalter. Zeitraum gilt auch für die Liste unten.
+      </p>
+      <FitnessDashboardOverview period={period} onPeriodChange={setPeriod} hidePeriodSelector />
+
+      {!hasList ? (
+        <EmptySection text="Noch keine Aktivitätsdaten im Verlauf." to="/activity" toLabel="Aktivität erfassen" />
+      ) : null}
 
       {/* Issue #31: Show active global quality filter */}
-      {globalQualityLevel && globalQualityLevel !== 'all' && (
+      {hasList && globalQualityLevel && globalQualityLevel !== 'all' && (
         <div style={{
           marginBottom:12, padding:'8px 12px', borderRadius:8,
           background:'var(--surface2)', border:'1px solid var(--border)',
@@ -1156,6 +1166,8 @@ function ActivitySection({ activities, insights, onRequest, loadingSlug, filterA
         </div>
       )}
 
+      {!hasList ? null : (
+      <>
       <div style={{display:'flex',gap:6,marginBottom:12}}>
         {[['Trainings',filtA.length,'var(--text1)'],['Kcal',totalKcal,'#EF9F27'],
           ['Stunden',Math.round(totalMin/60*10)/10,'#378ADD'],
@@ -1186,7 +1198,7 @@ function ActivitySection({ activities, insights, onRequest, loadingSlug, filterA
           <div key={type} style={{display:'flex',alignItems:'center',gap:8,padding:'4px 0',borderBottom:'1px solid var(--border)'}}>
             <div style={{flex:1,fontSize:13}}>{type}</div>
             <div style={{fontSize:12,color:'var(--text3)'}}>{count}×</div>
-            <div style={{width:Math.max(4,Math.round(count/filtA.length*80)),height:6,background:'#EF9F2788',borderRadius:3}}/>
+            <div style={{width:Math.max(4,Math.round(count/Math.max(1,filtA.length)*80)),height:6,background:'#EF9F2788',borderRadius:3}}/>
           </div>
         ))}
       </div>
@@ -1199,6 +1211,8 @@ function ActivitySection({ activities, insights, onRequest, loadingSlug, filterA
         {actRules.map((item,i)=><RuleCard key={i} item={item}/>)}
       </div>
       <InsightBox insights={insights} slugs={filterActiveSlugs(['aktivitaet'])} onRequest={onRequest} loading={loadingSlug}/>
+      </>
+      )}
     </div>
   )
 }