desktop: add electron version (#15663)

packages/desktop-electron/electron.vite.config.ts

@@ -0,0 +1,41 @@
+import { defineConfig } from "electron-vite"
+import appPlugin from "@opencode-ai/app/vite"
+
+const channel = (() => {
+  const raw = process.env.OPENCODE_CHANNEL
+  if (raw === "dev" || raw === "beta" || raw === "prod") return raw
+  return "dev"
+})()
+
+export default defineConfig({
+  main: {
+    define: {
+      "import.meta.env.OPENCODE_CHANNEL": JSON.stringify(channel),
+    },
+    build: {
+      rollupOptions: {
+        input: { index: "src/main/index.ts" },
+      },
+    },
+  },
+  preload: {
+    build: {
+      rollupOptions: {
+        input: { index: "src/preload/index.ts" },
+      },
+    },
+  },
+  renderer: {
+    plugins: [appPlugin],
+    publicDir: "../app/public",
+    root: "src/renderer",
+    build: {
+      rollupOptions: {
+        input: {
+          main: "src/renderer/index.html",
+          loading: "src/renderer/loading.html",
+        },
+      },
+    },
+  },
+})