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## What changed - Add configurable `sidebar_up` and `sidebar_down` actions to cycle through tabs with wraparound while the sidebar has focus. Default leader shortcuts use `Shift-Tab` / `Tab`, `Up` / `Down`, and `k` / `j`. - Support mouse-wheel tab switching over the tab strip and clickable overflow arrows when tabs do not fit. - Show previous/next tab shortcuts in the leader HUD and keymap picker, and preserve pane zoom when switching tabs. ## Testing Extend sidebar interaction tests and snapshots to cover overflow arrows, mouse-wheel navigation, leader shortcuts, repeated custom bindings, draft preservation, and scroll handling where the leader HUD overlaps the tab strip. GitOrigin-RevId: 39ccb40f40560d1be850397f9597e765caa996a3