Use MischLabs artwork for PWA icons

Brain.md

@@ -91,11 +91,11 @@ mischlabs/
   - `theme_color`: #10b981
   - `background_color`: #0a0a0f
 - Icons:
+  - `icons/app-icon-source.png` (1024x1024, quadratischer Ausschnitt aus dem MischLabs-Bild)
   - `icons/apple-touch-icon.png` (180x180)
   - `icons/icon-192.png` (192x192)
   - `icons/icon-512.png` (512x512)
   - `icons/maskable-512.png` (512x512, maskable)
-  - `icons/app-icon.svg` als editierbare Quelle
 - Service Worker:
   - Cache-Name: `mischlabs-pwa-v1`
   - Cached die App-Shell (`/`, `index.html`, `style.css?v=8`, Manifest und Icons)

icons/app-icon.svg

@@ -1,27 +0,0 @@
-<svg width="1024" height="1024" viewBox="0 0 1024 1024" xmlns="http://www.w3.org/2000/svg">
-  <defs>
-    <linearGradient id="bg" x1="176" y1="116" x2="848" y2="908" gradientUnits="userSpaceOnUse">
-      <stop offset="0" stop-color="#14f1c6"/>
-      <stop offset="0.52" stop-color="#10b981"/>
-      <stop offset="1" stop-color="#0f766e"/>
-    </linearGradient>
-    <radialGradient id="glow" cx="0" cy="0" r="1" gradientUnits="userSpaceOnUse" gradientTransform="translate(320 236) rotate(52) scale(690)">
-      <stop stop-color="#ecfeff" stop-opacity="0.9"/>
-      <stop offset="0.42" stop-color="#99f6e4" stop-opacity="0.2"/>
-      <stop offset="1" stop-color="#042f2e" stop-opacity="0"/>
-    </radialGradient>
-    <filter id="shadow" x="120" y="132" width="784" height="784" filterUnits="userSpaceOnUse" color-interpolation-filters="sRGB">
-      <feDropShadow dx="0" dy="28" stdDeviation="38" flood-color="#042f2e" flood-opacity="0.34"/>
-    </filter>
-  </defs>
-  <rect width="1024" height="1024" rx="230" fill="#071412"/>
-  <rect x="72" y="72" width="880" height="880" rx="196" fill="url(#bg)"/>
-  <rect x="72" y="72" width="880" height="880" rx="196" fill="url(#glow)"/>
-  <g filter="url(#shadow)">
-    <path d="M294 690V334h88l130 205 130-205h88v356h-86V481L538 648h-52L380 482v208h-86Z" fill="#f8fffc"/>
-    <path d="M283 752h458" stroke="#d9fff4" stroke-width="42" stroke-linecap="round" opacity="0.72"/>
-  </g>
-  <circle cx="746" cy="276" r="34" fill="#ecfeff" opacity="0.86"/>
-  <circle cx="812" cy="350" r="17" fill="#ecfeff" opacity="0.64"/>
-</svg>
-