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/hooks/useUpdatePageLayoutWidget.ts

@@ -1,23 +0,0 @@
-import { useRecoilCallback } from 'recoil';
-import { type PageLayoutWidget } from '../states/savedPageLayoutsState';
-import { pageLayoutDraftState } from '../states/pageLayoutDraftState';
-
-export const useUpdatePageLayoutWidget = () => {
-  const updatePageLayoutWidget = useRecoilCallback(
-    ({ set }) =>
-      (widgetId: string, updates: Partial<PageLayoutWidget>) => {
-        set(pageLayoutDraftState, (prev) => ({
-          ...prev,
-          tabs: prev.tabs.map((tab) => ({
-            ...tab,
-            widgets: tab.widgets.map((widget) =>
-              widget.id === widgetId ? { ...widget, ...updates } : widget,
-            ),
-          })),
-        }));
-      },
-    [],
-  );
-
-  return { updatePageLayoutWidget };
-};