feat: update PWA support and enhance responsive design

- Added PWA meta tags for improved iOS web app compatibility in index.html.
- Updated app.css to refine responsive design, ensuring better layout handling on mobile devices.
- Adjusted padding and height properties to accommodate safe area insets for a more polished user experience.

frontend/index.html

@@ -5,16 +5,21 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover" />
     <meta name="description" content="Shinkan Jinkendo - Trainer- und Vereinsplattform für Kampfsport-Trainingsplanung" />
 
-    <!-- PWA Meta Tags -->
+    <!-- PWA / iOS Web App -->
+    <meta name="theme-color" content="#1D9E75" media="(prefers-color-scheme: light)">
+    <meta name="theme-color" content="#181816" media="(prefers-color-scheme: dark)">
+    <meta name="mobile-web-app-capable" content="yes">
     <meta name="apple-mobile-web-app-capable" content="yes">
-    <meta name="apple-mobile-web-app-status-bar-style" content="default">
+    <!-- black-translucent: Inhalt bis unter die Statusleiste; passt zu viewport-fit=cover -->
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
     <meta name="apple-mobile-web-app-title" content="Shinkan">
-    <link rel="apple-touch-icon" href="/icon-192.png">
+    <link rel="manifest" href="/manifest.webmanifest" />
 
-    <!-- Icons -->
+    <!-- Icons (Dateien in public/) -->
+    <link rel="apple-touch-icon" href="/apple-touch-icon.png" sizes="180x180">
     <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32.png">
     <link rel="icon" type="image/png" sizes="192x192" href="/icon-192.png">
-    <link rel="shortcut icon" href="/favicon.ico">
+    <link rel="icon" type="image/png" sizes="512x512" href="/icon-512.png">
 
     <title>Shinkan Jinkendo</title>
   </head>

frontend/public/manifest.webmanifest

@@ -0,0 +1,25 @@
+{
+  "name": "Shinkan Jinkendo",
+  "short_name": "Shinkan",
+  "description": "Trainer- und Vereinsplattform für Kampfsport-Trainingsplanung",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#f4f3ef",
+  "theme_color": "#1D9E75",
+  "lang": "de",
+  "icons": [
+    {
+      "src": "/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ]
+}

frontend/src/app.css

@@ -33,18 +33,28 @@
 html, body, #root { height: 100%; }
 body { font-family: var(--font); background: var(--bg); color: var(--text1); -webkit-text-size-adjust: 100%; }
 
-.app-shell { display: flex; flex-direction: column; height: 100%; max-width: 600px; margin: 0 auto; }
+.app-shell { display: flex; flex-direction: column; min-height: 100%; min-height: 100dvh; max-width: 600px; margin: 0 auto; }
 .app-header {
   height: var(--header-h); display: flex; align-items: center; padding: 0 16px;
   background: var(--surface); border-bottom: 1px solid var(--border);
   position: sticky; top: 0; z-index: 10;
 }
+/* iPhone: Web-App (standalone) / Safari mit viewport-fit=cover — Kopf unter Statusleiste ausrichten */
+@media (max-width: 1023px) {
+  .app-header.app-header--mobile {
+    height: auto;
+    min-height: calc(var(--header-h) + env(safe-area-inset-top, 0px));
+    padding-top: env(safe-area-inset-top, 0px);
+    padding-left: max(16px, env(safe-area-inset-left, 0px));
+    padding-right: max(16px, env(safe-area-inset-right, 0px));
+  }
+}
 .app-logo { font-size: 18px; font-weight: 700; color: var(--accent); letter-spacing: -0.02em; }
 /* unten: Tab-Leiste + Abstand nach oben zur Leiste + Home-Indicator (iPhone) */
 .app-main {
   flex: 1;
   overflow-y: auto;
-  padding: 16px 16px calc(var(--nav-h) + var(--nav-pad-top) + env(safe-area-inset-bottom, 0px) + 20px);
+  padding: 16px max(16px, env(safe-area-inset-right, 0px)) calc(var(--nav-h) + var(--nav-pad-top) + env(safe-area-inset-bottom, 0px) + 20px) max(16px, env(safe-area-inset-left, 0px));
 }
 
 .bottom-nav {
@@ -66,7 +76,7 @@ body { font-family: var(--font); background: var(--bg); color: var(--text1); -we
   -ms-overflow-style: none;
   justify-content: flex-start;
   gap: 2px;
-  padding: var(--nav-pad-top) 6px env(safe-area-inset-bottom, 0px);
+  padding: var(--nav-pad-top) max(6px, env(safe-area-inset-right, 0px)) env(safe-area-inset-bottom, 0px) max(6px, env(safe-area-inset-left, 0px));
   min-height: calc(var(--nav-h) + var(--nav-pad-top) + env(safe-area-inset-bottom, 0px));
   height: auto;
   box-sizing: border-box;
@@ -2174,7 +2184,8 @@ a.analysis-split__nav-item {
   .app-shell {
     display: flex;
     flex-direction: column;
-    height: 100%;
+    min-height: 100%;
+    min-height: 100dvh;
     max-width: 600px;
     margin: 0 auto;
   }