fold-toggle

The ONE sidebar fold/unfold affordance — an Obsidian-style panel icon button (outlined panel, filled inner bar) shared by every master-list fold site — the eval/issues master-detail shells ([[evals-view]], [[issues-view]]) and the session console's Eval-tab list strip — so folding reads as one grammar, never three hand-drawn arrows.

raw source

Three surfaces let a human fold a master list to a thin strip — the Evals page, the Issues page, and the session console's Eval tab — and all three used to draw their own text arrow (‹ / ›). The human called the arrows odd: a fold toggle is a known idiom, and the known face for it is Obsidian's sidebar toggle — a small outlined panel with a filled bar marking the sidebar column. So the affordance becomes ONE shared icon button, drawn once, worn everywhere a list folds.

expanded spec

• One component, three homes. FoldToggle.jsx exports the icon (FoldToggleIcon) and the button around it; the fold sites — evals-view's shared EvalMasterDetail shell (fv-fold / fv-unfold), issues-view's master column (same classes), and the session console's si-list-unfold strip — render it instead of holding their own copy of the SVG. The className stays the site's: it carries the geometry (a 22px square badge riding the filter bar, or a full-height slim strip), never the glyph.
• The glyph is Obsidian's sidebar toggle. A 24×24 outlined panel (fill=none, stroke=currentColor, width 2, round caps/joins): an outer rounded rect with an inner filled vertical bar (sidebar-toggle-icon-inner, its own class so the bar can be styled apart later) marking the list column. Fold and unfold wear the SAME icon — Obsidian keeps one glyph for a sidebar open or collapsed, and the direction lives in the button's title/aria-label (masterList.fold / masterList.unfold), not in a mirrored drawing.
• Tint is the button's. The SVG inks currentColor, so each site's existing rest/hover colors (muted → blue) keep working with no icon-specific palette. On the folded strip the icon sits at the top — where the fold badge sat — so the toggle never moves under the pointer across a fold.