fix: set base path to relative for Electron file:// protocol compatibility

Added base: './' to vite config to generate relative asset paths instead
of absolute paths. This fixes ERR_FILE_NOT_FOUND errors when loading
JavaScript and CSS bundles in Electron apps using file:// protocol.

Fixes white screen issue where React app wasn't loading due to 404s on
all asset files (index.js, vendor chunks, CSS, registerSW.js).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: KevenWMarkham

vite.config.ts

@@ -5,6 +5,7 @@ import { VitePWA } from 'vite-plugin-pwa'
 
 // https://vite.dev/config/
 export default defineConfig({
+  base: './', // Use relative paths for Electron compatibility
   plugins: [
     react(),
     VitePWA({