fix(ui5-li): only handle F7/F2 when tabbable elements exist

F7 and F2 navigation now checks if there are tabbable elements
inside the list item before handling the event. If no tabbable
elements exist (e.g., delete button with tabindex="-1"), the
event propagates to allow parent components like Tokenizer to
handle it with their custom logic.

This fixes interference with Tokenizer's F7 behavior while
maintaining correct navigation for custom list items.

Author: kgogov

packages/main/src/ListItem.ts

@@ -535,12 +535,17 @@ abstract class ListItem extends ListItemBase {
 	}
 
 	_handleF7(e: KeyboardEvent) {
-		e.preventDefault();
-
 		const focusDomRef = this.getFocusDomRef()!;
 		const activeElement = getActiveElement();
 		const list = this._getList();
 
+		const focusables = this._getFocusableElements().length > 0;
+		if (!focusables) {
+			return;
+		}
+
+		e.preventDefault();
+
 		if (activeElement === focusDomRef) {
 			this._focusInternalElement(list);
 		} else {
@@ -555,6 +560,11 @@ abstract class ListItem extends ListItemBase {
 		const focusDomRef = this.getFocusDomRef()!;
 		const activeElement = getActiveElement();
 
+		const focusables = this._getFocusableElements().length > 0;
+		if (!focusables) {
+			return;
+		}
+
 		if (activeElement === focusDomRef) {
 			const firstFocusable = await getFirstFocusableElement(focusDomRef);
 			firstFocusable?.focus();