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/context-store/components/MainContextStoreProvider.tsx

@@ -3,10 +3,10 @@ import { useIsSettingsPage } from '@/navigation/hooks/useIsSettingsPage';
 import { useLastVisitedView } from '@/navigation/hooks/useLastVisitedView';
 import { objectMetadataItemsState } from '@/object-metadata/states/objectMetadataItemsState';
 import { prefetchIndexViewIdFromObjectMetadataItemFamilySelector } from '@/prefetch/states/selector/prefetchIndexViewIdFromObjectMetadataItemFamilySelector';
+import { AppPath } from '@/types/AppPath';
 import { useShowAuthModal } from '@/ui/layout/hooks/useShowAuthModal';
 import { useLocation, useParams, useSearchParams } from 'react-router-dom';
 import { useRecoilValue } from 'recoil';
-import { AppPath } from 'twenty-shared/types';
 import { isDefined } from 'twenty-shared/utils';
 import { isMatchingLocation } from '~/utils/isMatchingLocation';