Presenter mode drops children of the divider

[maboukerfa]

The divider block accepts children, and in the slides separation logic, the divider and all its children are ignored.

docs/src/frontend/apps/impress/src/features/docs/doc-presenter/hooks/useSlides.ts

Lines 25 to 32 in ccb44ae

	for (const block of blocks) {
	if (block.type === 'divider') {
	groups.push(current);
	current = [];
	continue;
	}
	current.push(block);
	}

Screen.Recording.2026-06-04.at.13.44.56.mov

PS:
I don’t know whether this should be reported in Blocknote or handled here in an ad‑hoc way.