Wire up Tailwind CSS 4, Vitest, and core app libraries

Add Tailwind (via Vite plugin), Vitest+RTL test setup, and the
Zustand/TanStack Query/Lucide libraries the architecture plan calls
for. Strip the electron-vite demo boilerplate (logo, IPC ping demo,
Versions component) in favor of a minimal placeholder screen.

Verified: typecheck, lint, and test suite all pass; pnpm dev boots
and serves the correct renderer HTML.

src/main/index.ts

@@ -1,4 +1,4 @@
-import { app, shell, BrowserWindow, ipcMain } from 'electron'
+import { app, shell, BrowserWindow } from 'electron'
 import { join } from 'path'
 import { electronApp, optimizer, is } from '@electron-toolkit/utils'
 import icon from '../../resources/icon.png?asset'
@@ -6,8 +6,9 @@ import icon from '../../resources/icon.png?asset'
 function createWindow(): void {
   // Create the browser window.
   const mainWindow = new BrowserWindow({
-    width: 900,
-    height: 670,
+    title: 'Aurora Dockside',
+    width: 1100,
+    height: 720,
     show: false,
     autoHideMenuBar: true,
     ...(process.platform === 'linux' ? { icon } : {}),
@@ -40,7 +41,7 @@ function createWindow(): void {
 // Some APIs can only be used after this event occurs.
 app.whenReady().then(() => {
   // Set app user model id for windows
-  electronApp.setAppUserModelId('com.electron')
+  electronApp.setAppUserModelId('com.aurora-dockside.app')
 
   // Default open or close DevTools by F12 in development
   // and ignore CommandOrControl + R in production.
@@ -49,9 +50,6 @@ app.whenReady().then(() => {
     optimizer.watchWindowShortcuts(window)
   })
 
-  // IPC test
-  ipcMain.on('ping', () => console.log('pong'))
-
   createWindow()
 
   app.on('activate', function () {