fix(desktop): fall back to bundled renderer in dev

apps/desktop/src/main/create-window.ts

 import { BrowserWindow, Menu, app } from "electron";
+import { existsSync } from "node:fs";
 import path from "node:path";
 import { pathToFileURL } from "node:url";
 
+function resolveFileRendererEntry(): string {
+  return path.join(app.getAppPath(), "dist", "renderer", "index.html");
+}
+
+function hasExplicitRendererUrl(): boolean {
+  return Boolean(process.env.QJCLAW_RENDERER_URL?.trim() || process.env.VITE_DEV_SERVER_URL?.trim());
+}
+
 export function resolveRendererEntry(): string {
   if (!app.isPackaged) {
     return process.env.QJCLAW_RENDERER_URL ?? process.env.VITE_DEV_SERVER_URL ?? "http://127.0.0.1:5173";
   }
 
-  return path.join(app.getAppPath(), "dist", "renderer", "index.html");
+  return resolveFileRendererEntry();
 }
 
 function buildApplicationMenu(): Menu {
@@ -62,7 +71,13 @@ export function createMainWindow(smokeEnabled = false): BrowserWindow {
 export function loadMainWindowRenderer(window: BrowserWindow): Promise<void> {
   const rendererEntry = resolveRendererEntry();
   if (rendererEntry.startsWith("http://") || rendererEntry.startsWith("https://")) {
-    return window.loadURL(rendererEntry);
+    return window.loadURL(rendererEntry).catch((error: unknown) => {
+      const fileRendererEntry = resolveFileRendererEntry();
+      if (!app.isPackaged && !hasExplicitRendererUrl() && existsSync(fileRendererEntry)) {
+        return window.loadURL(pathToFileURL(fileRendererEntry).toString());
+      }
+      throw error;
+    });
   }
 
   return window.loadURL(pathToFileURL(rendererEntry).toString());