Every GridStackItem now renders a close button next to its drag grip,
mirroring the grip's hover affordance. Closing detaches the item
server-side; grid-stack.ts already unregisters widgets via its
MutationObserver, so the layout is persisted without an extra protocol.
Closable is on by default and can be turned off per item with
setClosable(false); GridStackItem.CloseEvent lets views react.
The GridStackView "remove last" toolbar button is dropped — per-widget
close replaces it, so the view no longer tracks a widget stack. Its
counter now only grows, keeping a closed widget's id from being handed
to a new widget (which would inherit the saved position).
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ue9ZtWUBQF4SuSHpzZ3zwq
Pit Friedrich