[Feat] Jump to previous user messages

[zoomote]

​Opened on behalf of @navedmerchant. View the task or mention @roomote for follow-up asks.

What changed

Adds a theme-aware chat navigation control that jumps backward through follow-up messages sent by the user. Repeated clicks move from the newest user message toward older messages, center each target, and stop at the oldest message without wrapping.

The control works alongside scroll-to-bottom, checkpoint, and approval actions. Focused behavior coverage, localized tooltip copy, and container-rendered dark/light visual baselines are included.

Why this change was made

Long AI responses make it difficult to find earlier user instructions in an active task. This provides a direct way to revisit those messages without manually scanning the conversation.

Impact

Users can quickly navigate their own follow-up messages while preserving the existing streaming and browsing behavior. The full Zoo-Code test suite, lint, type checks, translation checks, E2E checks, CodeQL, and visual-regression workflow pass.

Related PRs

• Zoo-Code-Docs #56

[github-actions]

Review status

This PR was opened by an automated account. A human maintainer must verify the change intent, provenance, and validation before merging.

Current step: Resolve the merge conflicts. The review sequence resumes after the branch is mergeable.

Review-state labels are managed by this workflow; do not edit them manually.

[codecov]

Codecov Report

❌ Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
webview-ui/src/components/chat/ChatView.tsx	96.42%	0 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!

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