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The minimap only indexed the loaded page, and older pages were fetched solely by the top sentinel when the main chat area scrolled up. A single agent turn can span hundreds of entries, so the default 50-entry page often holds zero or one user turn and the minimap loses its navigation value. Add a "Load earlier" row at the top of the minimap preview. Extract the sentinel's fetch into one guarded loadOlderPage shared by both triggers, so the row reuses the in-flight guard and scroll anchoring. The preview panel now also renders when no turn is loaded yet but earlier history exists, which is exactly the huge-single-turn case. Verified in a 1428-entry session: 28 loads take the minimap from 1 to all 19 user turns, after which the row disappears; scrolling to the top still paginates through the sentinel.
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The minimap only indexed the loaded page, and older pages were fetched solely by the top sentinel when the main chat area scrolled up. A single agent turn can span hundreds of entries, so the default 50-entry page often holds zero or one user turn and the minimap loses its navigation value.
Add a "Load earlier" row at the top of the minimap preview. Extract the sentinel's fetch into one guarded loadOlderPage shared by both triggers, so the row reuses the in-flight guard and scroll anchoring. The preview panel now also renders when no turn is loaded yet but earlier history exists, which is exactly the huge-single-turn case.
Verified in a 1428-entry session: 28 loads take the minimap from 1 to all 19 user turns, after which the row disappears; scrolling to the top still paginates through the sentinel.