The GitHub IDE plugin for Zed use http instead of https on local server which start authflow

**Steps:**

1. When start the IDE Plugin it ask to authenticate with GitHub Copilot. When user click authenticate the following url is open in the browser. `http://127.0.0.1:33428/signin?nonce=`
2. Most modern browsers doesn't load http pages like Safari for example.

A workaround is to change the url from `http://127.0.0.1:33428/signin?nonce=` to `https://127.0.0.1:33428/signin?nonce=`. This allow the auth flow to redirect to Github App Permission page and authenticate.

3. But then again the problem encounters with the callback url which is `http://127.0.0.1:33428/callback?browser_session_id=`.

A workaround for this is again to change from `http` to `https` to complete the auth flow.

Start with the Zed IDE plugin's local authentication flow and inspect how it opens the /signin URL and handles the /callback URL on 127.0.0.1:33428. Compare both URLs with the browser behavior described, and consider the flow complete when authentication works without manually changing http to https.

索引モデルが issue の本文から書いたものです。