chore(desktop): add standalone vite config for browser-only dev

Enables running just the renderer at :5175 without Electron, useful
for headless Linux dev (no $DISPLAY). Defines __APP_VERSION__ so
TopBar renders without the electron-vite pipeline.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: tiegebentley

apps/desktop/vite.browser.config.ts

@@ -0,0 +1,10 @@
+import { resolve } from 'node:path';
+import react from '@vitejs/plugin-react';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+  root: resolve(__dirname, 'src/renderer'),
+  define: { __APP_VERSION__: JSON.stringify('0.2.0') },
+  plugins: [react()],
+  server: { host: '127.0.0.1', port: 5175 },
+});