feat(open): switch to cross-platform 'open' package for reliable URL opening across Windows/macOS/Linux

Replace brittle platform-specific 'open' invocation in npm-app/src/client.ts with the cross-platform 'open' package; add dependency in npm-app/package.json; this simplifies login flow and reduces test brittleness.

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Co-Authored-By: Codebuff <noreply@codebuff.com>

Author: brandonkachen

bun.lock

@@ -54,6 +54,7 @@
     "micromatch": "^4.0.8",
     "nanoid": "5.0.7",
     "onetime": "5.1.2",
+    "open": "^10.2.0",
     "picocolors": "1.1.0",
     "pino": "9.4.0",
     "posthog-node": "4.17.2",

npm-app/package.json

@@ -1,4 +1,5 @@
 import { spawn } from 'child_process'
+import open from 'open'
 import {
   existsSync,
   mkdirSync,
@@ -598,15 +599,9 @@ export class Client {
       console.log(responseToUser.join('\n'))
 
       let shouldRequestLogin = true
-      CLI.getInstance().rl.once('line', () => {
+      CLI.getInstance().rl.once('line', async () => {
         if (shouldRequestLogin) {
-          const openCommand =
-            process.platform === 'win32'
-              ? 'start'
-              : process.platform === 'linux'
-                ? 'xdg-open'
-                : 'open'
-          spawn(openCommand, [loginUrl])
+          await open(loginUrl)
           console.log(
             "Opened a browser window to log you in! If it doesn't open automatically, you can click this link:",
           )