fix: keep focus on the current workspace when another self-closes (#1912)

handle_pane_died only clamped the stale active/selected indices after
removing a workspace that closed itself, so it never shifted them down
when the removed workspace sat before the focused one. With workspaces
[x, y, z] and focus on y, removing x left active pointing at z, silently
moving the user into a workspace they did not select.

Resolve both indices by workspace id across the removal, as
close_selected_workspace already does, keeping the clamp as the fallback
for when the removed workspace was the focused one. Also scroll the
focused workspace back into view, which the explicit-close path already
did and this one did not.

refs #1621

Co-authored-by: Can Celik <ogulcancelik@gmail.com>

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