fix: blank window — vite base must be relative for electrobun

Vite defaults to base: '/' producing absolute asset paths like
/assets/index.js. Electrobun loads views from the filesystem where
absolute paths don't resolve. Setting base: './' produces relative
paths (./assets/index.js) that work in the webview.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: cloutprotocol

vite.config.ts

@@ -4,6 +4,7 @@ import react from "@vitejs/plugin-react";
 export default defineConfig({
 	plugins: [react()],
 	root: "src/mainview",
+	base: "./",
 	build: {
 		outDir: "../../dist",
 		emptyOutDir: true,