Show toast when roll-all-initiative skips combatants without loaded sources

Previously the button silently did nothing for creatures whose bestiary
source wasn't loaded. Now it reports how many were skipped and why. Also
keeps the roll-all button visible (but disabled) when there's nothing
left to roll, and moves toasts to the bottom-left corner.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/components/action-bar.tsx

@@ -40,6 +40,7 @@ interface ActionBarProps {
 	onManagePlayers?: () => void;
 	onRollAllInitiative?: () => void;
 	showRollAllInitiative?: boolean;
+	rollAllInitiativeDisabled?: boolean;
 	onOpenSourceManager?: () => void;
 	autoFocus?: boolean;
 }
@@ -262,6 +263,7 @@ export function ActionBar({
 	onManagePlayers,
 	onRollAllInitiative,
 	showRollAllInitiative,
+	rollAllInitiativeDisabled,
 	onOpenSourceManager,
 	autoFocus,
 }: ActionBarProps) {
@@ -575,6 +577,7 @@ export function ActionBar({
 						variant="ghost"
 						className="text-muted-foreground hover:text-hover-action"
 						onClick={onRollAllInitiative}
+						disabled={rollAllInitiativeDisabled}
 						title="Roll all initiative"
 						aria-label="Roll all initiative"
 					>