fix(web-ui): snap chat to bottom instantly on pane tab re-activation (#565)

* fix(web-ui): snap chat to bottom instantly on pane tab re-activation

Dockview hides inactive tab panels with display:none, so a re-shown pane
loses its scroll position and the ResizeObserver-triggered redraw catches
up through the smooth-scroll path (.chat-scroll has scroll-behavior:
smooth), visibly animating to the bottom. Re-activating an already-loaded
pane now resyncs density (a hidden pane measured 0x0) and redraws with
forceScroll, which snaps with scroll-behavior:auto.

* ci: retrigger checks after GitHub outage

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Co-authored-by: Josh France <josh@ycombinator.com>