Implement enhanced window management for Windows platform

- Introduced syncWindowsWebviewLayout function to ensure webview layout updates with window size changes.
- Added applyWindowsStartupWindowState function to manage window state and layout synchronization during startup on Windows.
- Updated createMainWindow to call applyWindowsStartupWindowState for improved initial window handling on Windows.

src/desktop/window.js

@@ -115,15 +115,36 @@ function broadcastWindowState() {
 function applyStartupWindowState(window) {
   if (!window) return
 
-  if (isMacOS) {
-    window.maximize?.()
-  } else if (process.platform === 'win32') {
+  if (isMacOS || process.platform === 'win32') {
     window.maximize?.()
   }
 
   setTimeout(broadcastWindowState, 100)
 }
 
+function syncWindowsWebviewLayout(window) {
+  if (!window?.getSize || !window?.setSize) {
+    return
+  }
+
+  const { width, height } = window.getSize()
+  if (!width || !height) {
+    return
+  }
+
+  // Re-apply the current size so the native webview relayouts to the window.
+  window.setSize(width, height)
+}
+
+function applyWindowsStartupWindowState(window) {
+  if (!window) return
+
+  syncWindowsWebviewLayout(window)
+  setTimeout(() => syncWindowsWebviewLayout(window), 0)
+  setTimeout(() => syncWindowsWebviewLayout(window), 100)
+  setTimeout(broadcastWindowState, 100)
+}
+
 function setupWindowEvents(window) {
   // Electrobun emits resize/focus, not Electron's maximize/fullscreen events.
   window.on?.('resize', broadcastWindowState)
@@ -213,6 +234,11 @@ export async function createMainWindow(rpc) {
   return new Promise((resolve) => {
     mainWindow.webview.on('dom-ready', () => {
       webviewDomReady = true
+
+      if (process.platform === 'win32') {
+        applyWindowsStartupWindowState(mainWindow)
+      }
+
       flushPendingNavigations()
       resolve(mainWindow)
     })