feat: initial PSG Launcher scaffold

vite.config.ts

@@ -0,0 +1,25 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+
+// Tauri dev server host (set by the CLI when using --host)
+const host = process.env.TAURI_DEV_HOST;
+
+export default defineConfig({
+  plugins: [react()],
+
+  // Prevent Vite from obscuring Rust errors
+  clearScreen: false,
+
+  server: {
+    port: 1420,
+    strictPort: true,
+    host: host || false,
+    hmr: host
+      ? { protocol: "ws", host, port: 1421 }
+      : undefined,
+    watch: {
+      // Tell Vite to ignore watching `src-tauri`
+      ignored: ["**/src-tauri/**"],
+    },
+  },
+});