Add Electron desktop shell workspace

apps/desktop/assets/README.md

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+# Desktop Asset Placeholders
+
+This folder is reserved for the Electron shell's packaged app assets.
+
+- `icon-placeholder.svg` is a visual stub only.
+- A real macOS release icon should eventually be added as `.icns` and then wired into `forge.config.ts`.

apps/desktop/assets/icon-placeholder.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" role="img" aria-labelledby="title">
+  <title>Islandflow desktop placeholder icon</title>
+  <defs>
+    <linearGradient id="bg" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" stop-color="#081017" />
+      <stop offset="100%" stop-color="#05070a" />
+    </linearGradient>
+    <linearGradient id="accent" x1="0%" y1="0%" x2="100%" y2="0%">
+      <stop offset="0%" stop-color="#f5a623" />
+      <stop offset="100%" stop-color="#ffd89a" />
+    </linearGradient>
+  </defs>
+  <rect width="256" height="256" rx="56" fill="url(#bg)" />
+  <path
+    d="M48 96h160v20H48zm0 44h114v20H48zm0 44h160v20H48z"
+    fill="url(#accent)"
+    opacity="0.94"
+  />
+  <circle cx="188" cy="150" r="22" fill="#25c17a" opacity="0.95" />
+</svg>