fix(desktop): install Electron before development (#39052)

packages/desktop/scripts/predev.ts

@@ -1,5 +1,7 @@
 import { $ } from "bun"
 
+await $`bun run install-electron`
+
 await $`bun ./scripts/copy-icons.ts ${process.env.OPENCODE_CHANNEL ?? "dev"}`
 
 await $`cd ../opencode && bun script/build-node.ts`