first commit

public/favicon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <defs>
+    <linearGradient id="g" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#4f46e5"/>
+      <stop offset="100%" style="stop-color:#7c3aed"/>
+    </linearGradient>
+  </defs>
+  <rect width="32" height="32" rx="8" fill="url(#g)"/>
+  <text x="16" y="22" font-size="18" font-family="system-ui,sans-serif" font-weight="700" fill="white" text-anchor="middle">=</text>
+</svg>

public/manifest.json

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+{
+  "name": "Calculatrice en ligne gratuite",
+  "short_name": "Calculatrice",
+  "description": "Calculatrice en ligne gratuite : mode simple et scientifique, historique, thème sombre.",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#f0f2f5",
+  "theme_color": "#4f46e5",
+  "orientation": "portrait-primary",
+  "categories": ["utilities", "education"],
+  "lang": "fr",
+  "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"
+    }
+  ]
+}