When several sessions are open on a large screen (≥1024px), the terminal
area can split into 1×2 or 2×2 so multiple LIVE, interactive terminals show
at once — a monitoring convenience for vibe-coding several Claude sessions.
Design keeps activeIndex as the single focused pane, so keybar/voice/approval
routing is unchanged; a new gridLayout + derived visible-set lets several
.term-cell wrappers show together inside a CSS-grid #term. The server and WS
protocol are untouched.
- public/grid-layout.ts (new): layout types/capacity, visibleIndices,
matchMedia desktop gate (GRID_MIN_WIDTH=1024), persistence, toolbar toggle.
- tabs.ts: pane→.term-cell wrapper (header + terminal + inline-approve footer);
applyLayout() owns show/hide + grid class + cell order + placeholders;
board-aware activate() (never focuses a hidden pane); setFocused/setGridLayout
delegate to it; renderCell/renderInlineApprove; refitVisible; notification
suppression for on-screen panes (factoring in the home overlay).
- terminal-session.ts: show({focus}) so non-focused quadrants don't steal
keyboard focus; onFocus callback (capture-phase pointerdown).
- main.ts: mount the toggle; window-focus refit → refitVisible.
- style.css: cell/grid model (.term-pane → relative flex child), focus ring,
pending pulse, inline approve, placeholder, toggle + coarse-pointer targets.
- tests: grid-layout.test.ts + split-grid block in tabs.test.ts (+33).
Adversarial review (4 lenses → per-finding verify) caught and fixed a HIGH:
activate() was not board-aware, so opening a tab on a full grid focused a
hidden pane (typing into an invisible session). Verified: typecheck + build:web
clean, 1566 tests pass, grid-layout 95% / tabs 94% coverage.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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