[Feat] Jump to previous user messages - #1487
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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.
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