Round 2 of PR review fixups:
- e2e: convert pane-resize-right/sidebar/edge-cases specs from
`page.mouse` drag-by-delta to a programmatic `splitview.resizeView()`
call. The mouse-drag approach was flaky in headless CI (5 chromium
failures across shards 2-4); the programmatic path tests the same
cap-enforcement and persistence contract without depending on
pointer-events targeting through a 1px .dv-sash overlay.
- dockview-layout-setup: remove an unreachable guard in
trackPinnedWidths — `rightIdx === 0 && sidebarVisible` cannot occur
given the `sv.length < 2` early return (Claude).
- dockview-layout-setup: cancel any in-flight debounce timer in the
setupLayoutPersistence disposer so a fire can't race with teardown
and persist stale layout (CodeRabbit).
- constants: document why LAYOUT_SIDEBAR_RATIO and LAYOUT_RIGHT_RATIO
are both 0.25 today — separate constants stay decoupled so a future
tweak to one doesn't silently change the other (Claude).
José Almeida
4e393b2448