Authenticate Connect shares in the in-app Browser

[brsbl]

Human comments

What was wrong

The desktop Connect session was installed only in Electron's default session, while the in-app Browser uses the isolated persist:bb-browser session. Because Electron session partitions do not share cookies, Connect port-share requests from the Browser reached the 401 sign-in gate.

What changed

• Installs and verifies each minted Connect cookie in both the main and personal Browser sessions.
• Renews both session stores through the existing Connect renewal path.
• Keeps the server-provided .getbb.app cookie domain, covering both brsbl.getbb.app and <host>--<port>.getbb.app hosts.

How you verified

• Remote red proof: The regression saw zero Browser-session cookie writes before the fix.
• Remote green proof: Full CI passed, including the new desktop regression test.
• Desktop before/after evidence is blocked because this checkout runs on a headless Linux worker without an isolated desktop app. No bb Nightly, production app, or personal Browser was used.

BB-Thread-ID: thr_n92euqycph

AGENT GENERATED