Distillation

Date: Sep 9, 2026

• 🟡 (23:06) Task status: “Inspect one-row expanded rail option” and “Rebase cumulative branch onto latest upstream” completed; “Implement adaptive expanded tab density” in progress; “Typecheck and build fresh binary” pending.
• 🟡 (23:06) Inspected packages/app/src/components/titlebar-tab-rail-state.ts: TAB_RAIL_WIDTH_DEFAULT = 224, TAB_RAIL_WIDTH_MIN = 180, TAB_RAIL_WIDTH_MAX = 400, TAB_RAIL_COLLAPSE_THRESHOLD = 150, and TAB_RAIL_COLLAPSED_WIDTH = 56; persisted global "tab-rail" state stores width and collapsed.
• 🟡 (23:07) Code search found compact={props.compact} at packages/app/src/components/titlebar-tab-strip.tsx:71, :173, and :407, and compact={() => !expanded()} at packages/app/src/components/titlebar-tab-rail.tsx:174.
• 🟡 (23:07) Code search established TabNavItem derives vertical as !!props.vertical && !props.compact?.() in packages/app/src/components/titlebar-tab-nav.tsx:101; it has distinct row layout when nonvertical and metadata/title stacked layout when vertical.
• 🟡 (23:08) Assistant chose an explicit 200px density threshold: expanded rails at 200px or wider use one compact row; narrower expanded rails retain the metadata-and-title stack. Both modes remain vertically scrollable and draggable.
• 🟡 (23:08) An initial patch attempt against packages/app/src/components/titlebar-tab-nav.tsx failed because the expected context around forceTruncate?: boolean and suppressNavigation?: () => boolean did not match; inspection showed vertical?: boolean and compact?: () => boolean already occur between them at lines 34–37.
• 🟡 (23:08) Implemented adaptive rail density across packages/app/src/components/titlebar-tab-rail-state.ts, packages/app/src/components/titlebar-tab-rail.tsx, packages/app/src/components/titlebar-tab-strip.tsx, packages/app/src/components/titlebar-tab-nav.tsx, and packages/app/src/components/titlebar-tab-nav.css.
• 🔴 (23:09) User stated: “never inherited here.”
• 🟡 (23:09) Added TAB_RAIL_ONE_ROW_THRESHOLD = 200 to packages/app/src/components/titlebar-tab-rail-state.ts, documented as the width above which labels and controls fit in a single dense tab row.
• 🟡 (23:09) In packages/app/src/components/titlebar-tab-rail.tsx, imported TAB_RAIL_ONE_ROW_THRESHOLD and added const stacked = () => expanded() && rail.width() < TAB_RAIL_ONE_ROW_THRESHOLD; passed stacked={stacked} to TitlebarTabStrip while retaining orientation="vertical" and compact={() => !expanded()}.
• 🟡 (23:09) In packages/app/src/components/titlebar-tab-strip.tsx, added optional stacked?: () => boolean props to SessionTabSlot, SessionTabEntry, and TitlebarTabStrip, and propagated stacked through to TabNavItem.
• 🟡 (23:09) In packages/app/src/components/titlebar-tab-nav.tsx, added optional stacked?: () => boolean; changed vertical() from !!props.vertical && !props.compact?.() to !!props.vertical && !props.compact?.() && (props.stacked?.() ?? true); added data-stacked={vertical()} to the session tab root.
• 🟡 (23:09) In packages/app/src/components/titlebar-tab-nav.css, restricted vertical session-tab auto height, visible overflow, normal whitespace, 1.25rem title line height, and left/right metadata padding/reversal rules to [data-titlebar-tab][data-stacked="true"]; the relevant comment specifies that horizontal tabs’ fixed one-line dimensions are never inherited by expanded stacked vertical session tabs.
• 🟡 (23:09) Assistant inspected the adaptive-layout diff for prop coverage and reported packages/app typecheck passed via tsgo -b.
• 🟡 (23:09) Task status updated: “Implement adaptive expanded tab density” completed; “Typecheck and build fresh binary” in progress.
• 🟡 (23:10) packages/opencode validation command tsgo --noEmit failed on an existing unrelated type error: test/provider/transform.test.ts(3886,43): error TS2322: Type '"none"' is not assignable to type '"high" | "low" | "max" | "medium" | "xhigh" | undefined'.
• 🟡 (23:10) Assistant concluded the rail changes typecheck cleanly in packages/app; packages/opencode typecheck is blocked by the provider-test effort literal error and the assistant planned to build the standalone server artifact independently.