fix(desktop): shut down cleanly with workspace terminals (#3268)

Workspace terminal shutdown only signaled an npm wrapper, leaving Electron alive with broken output pipes. Make the signal-handling runner the terminal-owned process and route external Electron termination through the existing quit lifecycle.

packages/desktop/scripts/dev-runner.mjs

@@ -4,7 +4,11 @@ import path from "node:path";
 import { execFileSync, spawn } from "node:child_process";
 import { createRequire } from "node:module";
 import { fileURLToPath } from "node:url";
-import { createElectronSpawnOptions, resolveChildKillTarget } from "./dev-runner-config.mjs";
+import {
+  createElectronSpawnOptions,
+  registerDevRunnerShutdownSignals,
+  resolveChildKillTarget,
+} from "./dev-runner-config.mjs";
 
 import { resolveDevElectronArgs } from "./dev-runner-args.mjs";
 
@@ -159,8 +163,7 @@ function canConnect(port, host) {
   });
 }
 
-process.on("SIGINT", () => stopAll("SIGTERM"));
-process.on("SIGTERM", () => stopAll("SIGTERM"));
+registerDevRunnerShutdownSignals({ signalSource: process, stop: stopAll });
 
 spawnChild("metro", "npx", ["expo", "start", "--port", String(expoPort)], {
   cwd: appDir,