feat: add titlebar to popout window with minimize/maximize/close buttons

- Add window-minimize, window-maximize, window-close, window-is-maximized IPC handlers
- Add titlebar with window controls to PopoutPage
- Update preload and types for new window control APIs

electron/main.ts

@@ -491,6 +491,45 @@ ipcMain.handle('create-window', async (_event, tabData: { route: string; title:
   }
 });
 
+ipcMain.handle('window-minimize', async (event) => {
+  const win = BrowserWindow.fromWebContents(event.sender);
+  if (win) {
+    win.minimize();
+    return { success: true };
+  }
+  return { success: false };
+});
+
+ipcMain.handle('window-maximize', async (event) => {
+  const win = BrowserWindow.fromWebContents(event.sender);
+  if (win) {
+    if (win.isMaximized()) {
+      win.unmaximize();
+    } else {
+      win.maximize();
+    }
+    return { success: true, isMaximized: win.isMaximized() };
+  }
+  return { success: false };
+});
+
+ipcMain.handle('window-close', async (event) => {
+  const win = BrowserWindow.fromWebContents(event.sender);
+  if (win) {
+    win.close();
+    return { success: true };
+  }
+  return { success: false };
+});
+
+ipcMain.handle('window-is-maximized', async (event) => {
+  const win = BrowserWindow.fromWebContents(event.sender);
+  if (win) {
+    return { success: true, isMaximized: win.isMaximized() };
+  }
+  return { success: false, isMaximized: false };
+});
+
 async function startServer() {
   if (electronState.isDevelopment()) {
     log.info('In dev mode, assuming external servers are running.');

electron/preload.ts

@@ -54,4 +54,8 @@ contextBridge.exposeInMainWorld('electronAPI', {
   terminalGetStatus: () => ipcRenderer.invoke('terminal-get-status'),
   terminalGetPort: () => ipcRenderer.invoke('terminal-get-port'),
   createWindow: (tabData: { route: string; title: string }) => ipcRenderer.invoke('create-window', tabData),
+  windowMinimize: () => ipcRenderer.invoke('window-minimize'),
+  windowMaximize: () => ipcRenderer.invoke('window-maximize'),
+  windowClose: () => ipcRenderer.invoke('window-close'),
+  windowIsMaximized: () => ipcRenderer.invoke('window-is-maximized'),
 })