fix: mostrar errores fatales de arranque en producción (#22)

src/main/main.ts

@@ -1,4 +1,4 @@
-import { app, BrowserWindow, BrowserWindowConstructorOptions, shell } from "electron";
+import { app, BrowserWindow, BrowserWindowConstructorOptions, dialog, shell } from "electron";
 import { ChildProcess, spawn } from "node:child_process";
 import fs from "node:fs";
 import path from "node:path";
@@ -344,6 +344,28 @@ function log(...args: unknown[]): void {
   console.log("[scoreko-electron]", ...args);
 }
 
+function formatErrorMessage(error: unknown): string {
+  if (error instanceof Error) {
+    const stack = error.stack?.trim();
+    return stack && stack.length > 0 ? stack : error.message;
+  }
+
+  return String(error);
+}
+
+function showFatalError(message: string, error?: unknown): void {
+  const formattedError = error ? formatErrorMessage(error) : undefined;
+  const details = formattedError ? `${message}\n\n${formattedError}` : message;
+
+  console.error(details);
+
+  if (!app.isReady()) {
+    return;
+  }
+
+  dialog.showErrorBox("Scoreko - Error al iniciar", details);
+}
+
 function getOptionalEnv(name: string): string | undefined {
   const value = process.env[name]?.trim();
   return value && value.length > 0 ? value : undefined;
@@ -380,7 +402,7 @@ app.on("ready", () => {
   }
 
   launch().catch(async (error: unknown) => {
-    console.error("Failed to launch Scoreko wrapper", error);
+    showFatalError("No se pudo iniciar Scoreko.", error);
     closeLoadingWindow();
     app.exit(1);
   });
@@ -420,3 +442,11 @@ app.on("will-quit", () => {
 process.on("exit", () => {
   stopNodeCG();
 });
+
+process.on("uncaughtException", (error) => {
+  showFatalError("Error inesperado en el proceso principal de Electron.", error);
+});
+
+process.on("unhandledRejection", (reason) => {
+  showFatalError("Promesa no controlada en el proceso principal de Electron.", reason);
+});