Thinking heading text overflows the session timeline on long reasoning topics

Description

While the model is reasoning, the "Thinking…" status line shows the current reasoning topic next to the shimmer. When the topic string is long (e.g. a whole sentence or a path), the heading text overflows the timeline container to the right instead of being clipped. The row is a flex row with one shrinkable heading (flex: 1 1 auto; min-width: 0), but the heading itself has no overflow handling, so a nowrap heading pushes past the right edge.

Plugins

N/A

OpenCode version

dev (current upstream/dev)

Steps to reproduce

1. Start a session with a reasoning-capable model.
2. Let the model emit a long reasoning topic heading (several words / a path).
3. Observe the row: the heading text runs out past the right side of the timeline thread instead of truncating.

Screenshot and/or share link

N/A

Operating System

Windows 11 (independent of platform — also visible on Linux/macOS)

Terminal

N/A (app UI)

Related / duplicate check

• No open or closed issue matches this specific overflow; verified by search.