feat: Enhance Dashboard layout with responsive greeting and metrics display

docs/issues/PHASE_PLAN_RESPONSIVE_UI.md

@@ -3,7 +3,7 @@
 > **Gitea:** [#30 – Responsive UI](http://192.168.2.144:3000/Lars/mitai-jinkendo/issues/30)  
 > **Spec:** `.claude/docs/functional/RESPONSIVE_UI.md`  
 > **Breakpoint:** `<1024px` = Mobile (Bottom-Nav, bestehendes Verhalten), `≥1024px` = Desktop (Sidebar 220px)  
-> **Letzte Plan-Aktualisierung:** 2026-04-05
+> **Letzte Plan-Aktualisierung:** 2026-04-06
 
 ---
 
@@ -14,7 +14,7 @@
 | P0 | Vorbereitung & Baseline | ☑ erledigt | Spec `RESPONSIVE_UI.md` bereinigt |
 | P1 | App-Shell: Sidebar + Breakpoint + gemeinsame Navigation | ☑ erledigt | `DesktopSidebar`, `config/appNav.js`, Admin `/admin/*`-Highlight |
 | P2 | Globales Layout & Content-Bereich (CSS) | ☑ erledigt | Desktop: Header aus, Content max 1200px; Mobile unverändert Bottom-Nav |
-| P3 | Dashboard (Desktop-Grid) | ☐ pending | |
+| P3 | Dashboard (Desktop-Grid) | ☑ erledigt | 4-spaltige Kennzahlen; Begrüßung; Ernährung/Aktivität 2-spaltig |
 | P4 | Verlauf (Tabs links / Content rechts) | ☐ pending | |
 | P5 | Analyse (Prompts links / Ergebnis rechts) | ☐ pending | |
 | P6 | Erfassung / Capture & Formularseiten | ☐ pending | |

frontend/src/app.css

@@ -344,4 +344,82 @@ body { font-family: var(--font); background: var(--bg); color: var(--text1); -we
     width: 100%;
     box-sizing: border-box;
   }
+
+  /* Dashboard (P3): Begrüßung + Kennzahlen-Zeile */
+  .dashboard-greeting {
+    display: flex;
+    align-items: baseline;
+    justify-content: space-between;
+    gap: 16px;
+    flex-wrap: wrap;
+    margin-bottom: 16px;
+  }
+
+  .dashboard-greeting__meta {
+    margin-top: 0 !important;
+    text-align: right;
+  }
+}
+
+/* ── Dashboard layout (Mobile baseline + Desktop im Block oben teilweise) ─ */
+
+.dashboard-page {
+  width: 100%;
+}
+
+.dashboard-greeting {
+  margin-bottom: 16px;
+}
+
+.dashboard-stat-grid {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+  margin-bottom: 16px;
+}
+
+.dashboard-stat-card {
+  background: var(--surface);
+  border-radius: 12px;
+  padding: 12px 10px;
+  border: 1px solid var(--border);
+  transition: border-color 0.15s;
+  flex: 1 1 140px;
+  min-width: 80px;
+  box-sizing: border-box;
+}
+
+.dashboard-summary-row {
+  display: flex;
+  gap: 8px;
+  margin-bottom: 16px;
+}
+
+.dashboard-summary-row > .card {
+  flex: 1;
+  min-width: 0;
+}
+
+@media (min-width: 1024px) {
+  .dashboard-stat-grid {
+    display: grid;
+    grid-template-columns: repeat(4, minmax(0, 1fr));
+    gap: 10px;
+  }
+
+  .dashboard-stat-grid .dashboard-stat-card {
+    flex: unset;
+    min-width: 0;
+    width: 100%;
+  }
+
+  .dashboard-summary-row {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 12px;
+  }
+
+  .dashboard-summary-row > .card {
+    flex: unset;
+  }
 }

frontend/src/pages/Dashboard.jsx

@@ -148,11 +148,10 @@ function StatCard({ icon, label, value, unit, delta, deltaGoodWhenNeg=false, sub
   const deltaColor = delta==null ? null
     : (deltaGoodWhenNeg ? delta<0 : delta>0) ? 'var(--accent)' : 'var(--warn)'
   return (
-    <div onClick={onClick} style={{
-      flex:1, minWidth:80, background:'var(--surface)', borderRadius:12,
-      padding:'12px 10px', cursor:onClick?'pointer':'default',
-      border:'1px solid var(--border)', transition:'border-color 0.15s',
-    }}
+    <div
+      className="dashboard-stat-card"
+      onClick={onClick}
+      style={{ cursor: onClick ? 'pointer' : 'default' }}
     onMouseEnter={e=>onClick&&(e.currentTarget.style.borderColor='var(--accent)')}
     onMouseLeave={e=>onClick&&(e.currentTarget.style.borderColor='var(--border)')}>
       <div style={{fontSize:18,marginBottom:4}}>{icon}</div>
@@ -321,13 +320,13 @@ export default function Dashboard() {
   console.log('[Dashboard] hasAnyData=', hasAnyData, 'latestW=', !!latestW, 'latestCal=', !!latestCal, 'nutrition.length=', nutrition.length)
 
   return (
-    <div>
+    <div className="dashboard-page">
       {/* Header greeting */}
-      <div style={{marginBottom:16}}>
+      <div className="dashboard-greeting">
         <h1 style={{fontSize:22,fontWeight:800,margin:0,color:'var(--text1)'}}>
           Hallo, {activeProfile?.name||'Nutzer'} 👋
         </h1>
-        <div style={{fontSize:12,color:'var(--text3)',marginTop:2}}>
+        <div className="dashboard-greeting__meta" style={{fontSize:12,color:'var(--text3)',marginTop:2}}>
           {dayjs().format('dddd, DD. MMMM YYYY')}
           {latestW && ` · Letztes Update ${dayjs(latestW.date).format('DD.MM.')}`}
         </div>
@@ -362,8 +361,8 @@ export default function Dashboard() {
           <QuickWeight onSaved={load}/>
         </div>
 
-        {/* Key metrics */}
-        <div style={{display:'flex',gap:8,marginBottom:16,flexWrap:'wrap'}}>
+        {/* Key metrics — Mobile: flex-wrap; Desktop: 4-spaltig (RESPONSIVE_UI P3) */}
+        <div className="dashboard-stat-grid">
           <StatCard icon="⚖️" label="Gewicht" value={latestW?.weight??'–'} unit="kg"
             delta={wDelta} deltaGoodWhenNeg={true}
             sub={latestW ? dayjs(latestW.date).format('DD.MM.') : '–'}
@@ -451,7 +450,7 @@ export default function Dashboard() {
         )}
 
         {/* Activity + Nutrition summary row */}
-        <div style={{display:'flex',gap:8,marginBottom:16}}>
+        <div className="dashboard-summary-row">
           {(avgKcal||avgProtein) && (
             <div className="card" style={{flex:1,cursor:'pointer'}} onClick={()=>nav('/history',{state:{tab:'nutrition'}})}>
               <div style={{fontWeight:600,fontSize:12,marginBottom:8,color:'var(--text3)'}}>🍽️ ERNÄHRUNG (Ø 7T)</div>