Studio Code: Display login URL to improve experience in remote and headless environments

[sejas]

Related issues

• Fixes STU-1858

How AI was used in this PR

AI assisted with implementation and tests.

Proposed Changes

The CLI auth login flow previously only printed the WordPress.com authorization URL when the browser failed to launch — and buried it inside an error message. On remote VMs and headless/SSH sessions there is no local browser at all, so users were told to "complete authentication in your browser" with no usable link, leaving them stuck.

Now the login flow:

• Always prints the authorization URL explicitly, as a clean copyable line, whether or not a browser opens — so users on any machine can open it on another device and paste back the token.
• Downgrades a failed browser launch from a scary error to a friendly warning that points at the printed URL.

Testing Instructions

• npm run cli:build
• node apps/cli/dist/cli/main.mjs auth login observe the URL is also printed.
• node apps/cli/dist/cli/main.mjs code , and run /login
• observe the URL is also printed.

Before	After

Pre-merge Checklist

• Tests pass (npm test -- apps/cli/commands/auth/tests/login.test.ts)
• Lint clean (npx eslint)
• Manual verification of the live token exchange on a remote VM

[wpmobilebot]

📊 Performance Test Results

Comparing c18c432 vs trunk

app-size

Metric	trunk	c18c432	Diff	Change
App Size (Mac)	2341.84 MB	2341.84 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	c18c432	Diff	Change
load	1082 ms	1080 ms	2 ms	⚪ 0.0%

site-startup

Metric	trunk	c18c432	Diff	Change
siteCreation	6497 ms	6486 ms	11 ms	⚪ 0.0%
siteStartup	6993 ms	6982 ms	11 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)

[sejas]

I'm merging this. I'm happy to apply any feedback that could come.