Do not display border bottom for last widget of tab (#16856)

Closes [2030](https://github.com/twentyhq/core-team-issues/issues/2030).

Determines if a widget is the last visible widget in its parent tab. The
hook:
- Finds the tab containing the widget
- Filters widgets based on visibility rules (respects conditionalDisplay
and edit mode)
- Returns true if the current widget is the last in the filtered list
- Updated `WidgetCard`: Added isLastWidget prop to conditionally apply
border-bottom for the side-column variant
- Updated `WidgetRenderer`: Integrates the hook and passes isLastWidget
to WidgetCard

packages/twenty-front/src/modules/page-layout/widgets/components/WidgetRenderer.tsx

@@ -9,6 +9,7 @@ import { pageLayoutResizingWidgetIdComponentState } from '@/page-layout/states/p
 import { type PageLayoutWidget } from '@/page-layout/types/PageLayoutWidget';
 import { PageLayoutWidgetForbiddenDisplay } from '@/page-layout/widgets/components/PageLayoutWidgetForbiddenDisplay';
 import { WidgetContentRenderer } from '@/page-layout/widgets/components/WidgetContentRenderer';
+import { useIsCurrentWidgetLastOfTab } from '@/page-layout/widgets/hooks/useIsCurrentWidgetLastOfTab';
 import { useIsInPinnedTab } from '@/page-layout/widgets/hooks/useIsInPinnedTab';
 import { useWidgetActions } from '@/page-layout/widgets/hooks/useWidgetActions';
 import { useWidgetPermissions } from '@/page-layout/widgets/hooks/useWidgetPermissions';
@@ -67,6 +68,8 @@ export const WidgetRenderer = ({ widget }: WidgetRendererProps) => {
 
   const { currentPageLayout } = useCurrentPageLayoutOrThrow();
 
+  const isLastWidget = useIsCurrentWidgetLastOfTab(widget.id);
+
   // TODO: when we have more widgets without headers, we should use a more generic approach to hide the header
   // each widget type could have metadata (e.g., hasHeader: boolean or headerMode: 'always' | 'editOnly' | 'never')
   const isRichTextWidget = widget.type === WidgetType.STANDALONE_RICH_TEXT;
@@ -119,6 +122,7 @@ export const WidgetRenderer = ({ widget }: WidgetRendererProps) => {
         isEditing={isEditing}
         isDragging={isDragging}
         isResizing={isResizing}
+        isLastWidget={isLastWidget}
         onMouseEnter={handleMouseEnter}
         onMouseLeave={handleMouseLeave}
         data-widget-id={widget.id}