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l0ng-aiandl0ng-ai
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A pane's scroll position lives in alacritty's `display_offset` — rows of scrollback, not pixels of laid-out content — so it has no `ScrollHandle` to hand a scrollbar. `TerminalScrollHandle` implements gpui-component's `ScrollbarHandle` over the grid instead, which lets the pane draw the same `Scrollbar` the sidebar and every list already use: same theme, same `Scrolling` show mode, same fade-out. The bar never touches the terminal. `set_offset` only records the row it wants; `sync_scrollbar` applies that on the next render — clearing the sub-line remainder and cancelling an in-flight smooth scroll on the way — and reports back where the grid actually ended up. Scrollback piling up at the live edge is deliberately not reported: the bar shows itself whenever the offset it reads changed, so a pane printing a build log would otherwise hold a thumb on screen for as long as the output ran. Every other change passes through, including the history shrinking, which is a cleared scrollback rather than growth. Closes #432 Co-authored-by: l0ng-ai <24760907+l0ng-ai@users.noreply.github.com>