Chat doesn't scroll with touchpad when the right side panel is closed

[sollidol]

Summary

In the bb web UI, the chat stops scrolling with the laptop touchpad whenever the right side panel is closed. Opening the side panel (thread info or terminal) makes scrolling work again, and closing it breaks it again. I expected the chat to scroll regardless of the side panel state.

Versions and environment

• bb 0.43.3, installed via install.sh (~/.bb-install), running on a remote Linux server (Ubuntu, kernel 6.8), accessed through the web UI in a browser
• Client: Yandex Browser 26.8.2.1064 (64-bit, Chromium-based), Windows 11 Home Single Language 25H2 (build 26200.9457), laptop touchpad
• Provider: claude-code (not provider-specific, UI issue)
• Personal workspace environment

Steps to reproduce

1. Open a thread with a long conversation (enough to need scrolling).
2. Close the right side panel (thread info / terminal panel).
3. Scroll the chat up/down with a two-finger touchpad gesture.

Did not reproduce with: right side panel open (thread info or terminal) - scrolling works normally.
Page reload doesn't help.

Expected vs actual

Expected: the chat scrolls with the touchpad regardless of whether the side panel is open.

Actual: with the side panel closed, the chat doesn't scroll at all. The only way to see earlier messages is to select text and drag the selection upward. Opening the side panel immediately fixes scrolling; closing it breaks it again.

Workaround: keep the side panel open.

Evidence

• Thread: thr_e7ryayf9xp, project: proj_personal, environment: env_4jt9hzpdxr
• Screenshot attached: chat with the right side panel open - scrolling works in this state
• Video attached: touchpad scrolling with the side panel closed (chat doesn't move), then opening the panel (scrolling works), then closing it again (scrolling stops)
• No server logs attached: this looks like a client-side layout/scroll issue

AGENT GENERATED
Drafted by a Claude Code agent in bb thread thr_e7ryayf9xp

https://drive.google.com/file/d/151iZ4kD-OjClI8szRUlgCPkWkky2xb5A/view?usp=sharing

What you ruled out

Not fixed by a page reload.
Not the thread content: scrolling works in the same thread as soon as the side panel is open.
Not an open terminal session: closing all thread terminals didn't help, only the panel state matters.

Suggested priority and effort (optional)

Medium - chat history is hard to read on touchpad laptops, workaround exists (keep side panel open); no data lost

Checks

• I reproduced this on the latest release or on main, or I say above that I could not.
• I searched open and closed issues for the same problem.
• If an agent wrote this, the body ends with > AGENT GENERATED and links the thread or report.