UI update with sidebar and settings tabs (#3288)

Co-authored-by: Nahiyan Khan <nahiyan@squareup.com>
Co-authored-by: Taylor Ho <taylorkmho@gmail.com>
Co-authored-by: Lily Delalande <119957291+lily-de@users.noreply.github.com>
Co-authored-by: Spence <spencrmartin@gmail.com>
Co-authored-by: spencrmartin <spencermartin@squareup.com>
Co-authored-by: Judson Stephenson <Jud@users.noreply.github.com>
Co-authored-by: Max Novich <mnovich@squareup.com>
Co-authored-by: Best Codes <106822363+The-Best-Codes@users.noreply.github.com>
Co-authored-by: caroline-a-mckenzie <cmckenzie@squareup.com>
Co-authored-by: Michael Neale <michael.neale@gmail.com>

ui/desktop/vite.renderer.config.mts

@@ -0,0 +1,12 @@
+import { defineConfig } from 'vite';
+import tailwindcss from '@tailwindcss/vite';
+
+// https://vitejs.dev/config
+export default defineConfig({
+  define: {
+    // This replaces process.env.ALPHA with a literal at build time
+    'process.env.ALPHA': JSON.stringify(process.env.ALPHA === 'true'),
+  },
+
+  plugins: [tailwindcss()],
+});