fix(tui): copy oauth url when no device code

[itskingori]

Summary

Fixes #7838 by updating the c copy handler in the OAuth auto dialog to:

• Copy the device code if one exists in authorization.instructions
• Otherwise copy authorization.url (the long authorize URL)

No other behavior changes. This makes c copy consistently copy the thing you actually need to paste into the browser e.g. Copilot: copies the device code and ChatGPT Plus/Pro copies the full authorize URL.

Context

When connecting providers that use the OAuth "auto" flow in the TUI, OpenCode shows a URL, an instruction line, and a c copy hint. Pressing c previously copied authorization.instructions unless a device code (e.g. ABCD-EFGH) was detected inside it. For example ...

Login with GitHub Copilot
https://github.com/login/device
Enter code: [REDACTED]
Waiting for authorization...
c copy 

This worked for device-code style flows (e.g. GitHub Copilot), but for ChatGPT Plus/Pro the instructions are a generic sentence ("Complete authorization in your browser…"), so c copied that sentence instead of the actual authorize URL, from this ...

ChatGPT Pro/Plus
https://auth.openai.com/oauth/authorize?response_type=code&client_id=[REDACTED]&redirect_uri=http%3A%2F%2Flocalhost%3A1455%2Fauth%2Fcallback&scope=openid+profile+email+offline_access&code_challenge=[REDACTED]&code_challenge_method=S256&id_token_add_organizations=true&codex_cli_simplified_flow=true&state=[REDACTED]&originator=opencode
Complete authorization in your browser. This window will close automatically.
Waiting for authorization...
c copy 

Testing

I manually tested the TUI and confirmed what I expected was in the clipboard. Verified for Copilot and ChatGPT Plus/Pro ... I don't know if the other providers have flows outside what's mentioned here (and there are too many to manually check).

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