fix(desktop): honour the system proxy in main-process requests (#3270)

fluxer_desktop/src/main/Updater.ts

@@ -13,6 +13,7 @@ import {
 	sweepAbandonedAppImageUpdates,
 } from '@electron/main/AppImageUpdate';
 import {destroyDesktopTray} from '@electron/main/DesktopTray';
+import {moduleNetworkFetch} from '@electron/main/ModuleNetworkFetch';
 import {MANUAL_DESKTOP_FORMATS, type ManualDesktopFormat} from '@electron/main/ShellDownloadFormats';
 import {resolveShellUpdatePlan, ShellUpdateCapability} from '@electron/main/ShellUpdateCapability';
 import {relaunchAndExit} from '@electron/main/Troubleshooting';
@@ -33,7 +34,7 @@ import {
 	type UpdaterDownloadOption,
 } from '@electron/main/UpdaterDownloads';
 import {setQuitting} from '@electron/main/Window';
-import {app, autoUpdater, type BrowserWindow, ipcMain} from 'electron';
+import {app, autoUpdater, type BrowserWindow, ipcMain, net} from 'electron';
 import log from 'electron-log';
 import type {UpdateInfo, VelopackAsset} from 'velopack';
 
@@ -552,7 +553,7 @@ async function fetchManualLatest(options: {forceRefresh?: boolean} = {}): Promis
 	if (!options.forceRefresh && manualLatestCache && now - manualLatestCache.at < MANUAL_CACHE_TTL_MS) {
 		return manualLatestCache.info;
 	}
-	const response = await fetch(`${UPDATE_BASE_URL}/latest`, {
+	const response = await net.fetch(`${UPDATE_BASE_URL}/latest`, {
 		cache: 'no-store',
 		headers: {
 			Accept: 'application/json',
@@ -628,6 +629,7 @@ async function downloadAppImageUpdate(
 				target,
 				url,
 				expectedSha256,
+				fetchImpl: moduleNetworkFetch,
 				onProgress: ({transferred, total}) => {
 					const now = Date.now();
 					const dtMs = now - lastSampleAt;