Add a single-session desktop window picker and route screenshot assist, region crop, and fullscreen capture through the cached frame.

surfsense_desktop/src/window-picker-preload.ts

@@ -0,0 +1,15 @@
+import { contextBridge, ipcRenderer } from 'electron';
+import { IPC_CHANNELS } from './ipc/channels';
+
+contextBridge.exposeInMainWorld('surfsenseWindowPick', {
+  list: () =>
+    ipcRenderer.invoke(IPC_CHANNELS.WINDOW_PICK_LIST) as Promise<
+      { id: string; name: string; thumbDataUrl: string }[]
+    >,
+  submit: (sourceId: string) => {
+    ipcRenderer.send(IPC_CHANNELS.WINDOW_PICK_SUBMIT, sourceId);
+  },
+  cancel: () => {
+    ipcRenderer.send(IPC_CHANNELS.WINDOW_PICK_CANCEL);
+  },
+});