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/api/rest/core/query-builder/core-query-builder.factory.ts

@@ -1,8 +1,6 @@
 import { BadRequestException, Injectable } from '@nestjs/common';
 
 import { type Request } from 'express';
-import { SettingsPath } from 'twenty-shared/types';
-import { getSettingsPath } from 'twenty-shared/utils';
 
 import { CreateManyQueryFactory } from 'src/engine/api/rest/core/query-builder/factories/create-many-query.factory';
 import { CreateVariablesFactory } from 'src/engine/api/rest/core/query-builder/factories/create-variables.factory';
@@ -72,7 +70,7 @@ export class CoreQueryBuilderFactory {
         `No object was found for the workspace associated with this API key. You may generate a new one here ${this.domainManagerService
           .buildWorkspaceURL({
             workspace,
-            pathname: getSettingsPath(SettingsPath.ApiWebhooks),
+            pathname: '/settings/apis',
           })
           .toString()}`,
       );