add splash screen

vite.config.ts

@@ -1,5 +1,6 @@
 import { defineConfig } from "vite";
 import vue from "@vitejs/plugin-vue";
+import { resolve } from "path";
 
 // @ts-expect-error process is a nodejs global
 const host = process.env.TAURI_DEV_HOST;
@@ -29,4 +30,12 @@ export default defineConfig(async () => ({
       ignored: ["**/src-tauri/**"],
     },
   },
+  build: {
+    rollupOptions: {
+      input: {
+        main: resolve(__dirname, 'index.html'),
+        splashscreen: resolve(__dirname, 'splashscreen.html'),
+      },
+    },
+  },
 }));