The web list still said "open in the focused pane" with a 1px ring, the last edge left in it, and the TUI said it with the ● glyph alone. Both now use a background. Web: `--accent-fill`, the same 30% recipe `--preview-tint` uses, so the two tiers differ by hue rather than by strength. The row rules are also rewritten as one ordered run of equal-specificity `:where()` selectors, which is what `docs/SIDEBAR.md` claims the ladder is — `.is-open` moves in from the bottom of the multi-view block, where source order had been deciding its precedence by accident. TUI: `palette.pane_row_bg()`, blended partway from the card surface to the selection surface, so the sidebar reads unfilled / half filled / filled. It borrows the selection surface's foregrounds, since those are the ones picked for a filled row, and the cursor still wins on its own row. Blended rather than shipped as a third `Surface` — that would be eight more colours in each of seventeen presets — with palette tests asserting it stays a visible step from both surfaces and stays legible in every preset.