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-server/src/engine/core-modules/email-verification/services/email-verification.service.ts

@@ -8,7 +8,6 @@ import { addMilliseconds, differenceInMilliseconds } from 'date-fns';
 import ms from 'ms';
 import { SendEmailVerificationLinkEmail } from 'twenty-emails';
 import { type APP_LOCALES } from 'twenty-shared/translations';
-import { AppPath } from 'twenty-shared/types';
 import { isDefined } from 'twenty-shared/utils';
 import { Repository } from 'typeorm';
 
@@ -56,7 +55,7 @@ export class EmailVerificationService {
       await this.emailVerificationTokenService.generateToken(userId, email);
 
     const linkPathnameAndSearchParams = {
-      pathname: AppPath.VerifyEmail,
+      pathname: 'verify-email',
       searchParams: {
         emailVerificationToken,
         email,