* fix(web): guard dockview measure against mid-transition sidebar width
The unified AppSidebar (#1165) animates its width over 300ms; the dockview
content container (a flex sibling) can be measured mid-transition at a tiny
positive width in onReady, so the default layout builds too narrow and dockview
collapses the horizontal columns into a vertical stack. measureDockviewContainer
trusted any positive parent clientWidth. Reject an implausibly-small live width
(< 50% of viewport) as a not-yet-laid-out transient and fall back to the
viewport; the resize observer then snaps to the exact size.
* fix(web): preserve live height when width guard fires; assert it
José Almeida
2ed65cfde3