fix(web): navigate timeline minimap with the mouse wheel - #40
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- Move one message per wheel direction with boundary clamping - Add focused logic coverage for wheel navigation
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What Changed
Added mouse-wheel navigation to the chat timeline minimap. Scrolling over the minimap now moves one message at a time, clamps at the timeline boundaries, and preserves pointer-based selection behavior.
Added focused logic tests covering direction, boundary clamping, and invalid wheel input.
Why
The minimap supported pointer and keyboard navigation but ignored mouse-wheel input, making it less convenient to browse long timelines. Handling wheel events directly keeps navigation predictable and prevents the page from scrolling while the user is interacting with the minimap.
UI Changes
No screenshots or video included; this is a small interaction-only change to the existing timeline minimap.
Checklist