fix(web): keep turn minimap stable as composer grows

[extoci]

What Changed

Keep the turn minimap anchored to the full timeline viewport when the composer grows.

Why

Typing a multiline prompt increased the composer's bottom inset on the minimap itself. That shortened the minimap's positioning area and shifted the centered turn rail upward. The composer inset now remains limited to timeline scrolling and content clearance.

UI Changes

Before recording

bnefore.mov

After recording

after.mov

Checklist

• This PR is small and focused
• I explained what changed and why
• I included a video for animation/interaction changes

Implemented with gpt-5.6-sol via the Codex harness in T3 Code.

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Note

Low Risk
Small chat UI layout change; scroll inset behavior for the message list is unchanged.

Overview
Stops the turn minimap from shrinking and drifting when the composer gets taller (e.g. multiline prompts).

TimelineMinimap no longer takes bottomInset / contentInsetEndAdjustment. It is positioned with inset-y-0 on the timeline viewport instead of top-0 plus an inline bottom tied to the composer overlay height. LegendList still uses contentInsetEndAdjustment for end scrolling and content clearance—only the minimap rail stays full-height and stable.

^{Reviewed by Cursor Bugbot for commit 8e518f2. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix turn minimap to remain stable as the composer grows

The TimelineMinimap component was shifting position as the composer grew because it received a dynamic bottomInset that adjusted its bottom offset. This removes the bottomInset prop entirely and anchors the minimap to both top and bottom of its container using inset-y-0 instead of top-0.

^{Macroscope summarized 8e518f2.}

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[macroscopeapp]

Approvability

Verdict: Approved 8e518f2

This is a minor UI fix that simplifies the minimap's positioning by removing dynamic bottom inset calculation and using a straightforward CSS inset-y-0 class instead. The change removes complexity and has clear, limited scope.

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