Prevent csv export injections (#14347)

**Small Security Issue:** CSV exports were vulnerable to formula
injection attacks when users entered values starting with =, +, -, or @.
(only happens if a logged-in user injects corrupted data)

Solution:
- Added ZWJ (Zero-Width Joiner) protection that prefixes dangerous
values with invisible Unicode character
- This is the best way to preserve original data while preventing Excel
from executing formulas
- Added import cleanup to restore original values when re-importing
 
Changes:
- New sanitizeValueForCSVExport() function for security
- Updated all CSV export paths to use both security + formatting
functions
- Added comprehensive tests covering attack vectors and international
characters
- Also added cursor rules for better code consistency

---------

Co-authored-by: Charles Bochet <charlesBochet@users.noreply.github.com>

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

@@ -1,32 +0,0 @@
-import { IframeWidget } from '@/dashboards/widgets/iframe/components/IframeWidget';
-import { isString } from '@sniptt/guards';
-import { WidgetType } from '../mocks/mockWidgets';
-import { type PageLayoutWidget } from '../states/savedPageLayoutsState';
-import { GraphWidgetRenderer } from './GraphWidgetRenderer';
-
-type WidgetRendererProps = {
-  widget: PageLayoutWidget;
-};
-
-export const WidgetRenderer = ({ widget }: WidgetRendererProps) => {
-  switch (widget.type) {
-    case WidgetType.GRAPH:
-      return <GraphWidgetRenderer widget={widget} />;
-
-    case WidgetType.IFRAME: {
-      const url = widget.configuration?.url;
-      return (
-        <IframeWidget url={isString(url) ? url : ''} title={widget.title} />
-      );
-    }
-
-    case WidgetType.VIEW:
-      return null;
-
-    case WidgetType.FIELDS:
-      return null;
-
-    default:
-      return null;
-  }
-};