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/playground/components/PlaygroundSetupForm.tsx

@@ -3,6 +3,7 @@ import { SETTINGS_PLAYGROUND_FORM_SCHEMA_SELECT_OPTIONS } from '@/settings/playg
 import { playgroundApiKeyState } from '@/settings/playground/states/playgroundApiKeyState';
 import { PlaygroundSchemas } from '@/settings/playground/types/PlaygroundSchemas';
 import { PlaygroundTypes } from '@/settings/playground/types/PlaygroundTypes';
+import { SettingsPath } from '@/types/SettingsPath';
 import { Select } from '@/ui/input/components/Select';
 import { SettingsTextInput } from '@/ui/input/components/SettingsTextInput';
 import styled from '@emotion/styled';
@@ -10,7 +11,6 @@ import { zodResolver } from '@hookform/resolvers/zod';
 import { useLingui } from '@lingui/react/macro';
 import { Controller, useForm } from 'react-hook-form';
 import { useRecoilState } from 'recoil';
-import { SettingsPath } from 'twenty-shared/types';
 import { IconApi, IconBrandGraphql } from 'twenty-ui/display';
 import { Button } from 'twenty-ui/input';
 import { z } from 'zod';