feat(ui): add borderless chrome mode#481
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Replace drawn borders and separators with filled background bands derived from the active theme. Add a theme surface elevation ladder (code, contextBand, sidebar, sectionHeader, overlay, note, selection) so file headers, the unchanged-lines band, popups, and comment boxes stay visually distinct without lines. Route chrome through chromeSurfaceBg/overlaySurfaceStyle helpers and a ChromeSeparator primitive; the divider reveals an accent rule only while resizing. Toggle via the View menu, the borderless config key, or --borderless. A surfaces test asserts adjacent ladder levels stay distinct across every bundled theme.
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What
Adds an opt-in "borderless" chrome mode that replaces drawn borders and
separators with filled background bands derived from the active theme. The diff
still reads as distinct regions — file headers, the unchanged-lines band,
sidebar, popups, and comment boxes — but through layered surfaces instead of
lines, for a cleaner, modern look.
Bordered chrome remains the default; nothing changes unless you opt in.
How to toggle
--borderless/--no-borderlessCLI flagsborderlessconfig keyShift+Bkeybinding (listed in the?help)Demo
2026.06.23.17.11.19.mp4
How it works
Each theme gains a derived surface elevation ladder (
ChromeSurfaces)mapped from its existing semantic palette (editor / panel / titlebar tokens), so
authored themes look native and adjacent levels stay visually distinct. A small
set of primitives centralizes the border-vs-band decision so the choice never
scatters across components:
chromeSurfaceBg(theme, level)— resolve a surface background by ladder leveloverlaySurfaceStyle(theme)— bordered box vs filled band for popups/dialogsrailGlyph(theme)/ChromeSeparator— diff rails and separatorsTouched chrome: menu bar, status bar, file-section headers, sidebar, diff rails,
menus/dialogs/popups, agent comment cards, and the pane divider (which still
reveals a rule while dragging to resize).
Tests
on every bundled theme
Shift+Bstays out of the page-up alias)