The assistant-action jump now opens the Context tab on the right Sidebar
over the guarded `ctx.sidebarRight.openTab` optional seam (the column
expands in the same step, keeping the clicked reply in view) instead of
switching the conversation tab. Every harness or placement the seam
cannot serve — lines older than 0.1.5-rc.1, tab-only placement, no
mounted session surface, a hostile face — keeps the conversation-tab
activation as fallback. The tooltip is reworded neutrally ("Context
view") since the landing follows what the harness serves.