feat: enforce @/ alias for imports and fix all relative parent imports (#16787)

## Summary
This PR enforces the use of `@/` alias for imports instead of relative
parent imports (`../`).

## Changes

### ESLint Configuration
- Added `no-restricted-imports` pattern in `eslint.config.react.mjs` to
block `../*` imports with the message "Relative parent imports are not
allowed. Use @/ alias instead."
- Removed the non-working `import/no-relative-parent-imports` rule
(doesn't work properly in ESLint flat config)

### VS Code Settings
- Added `javascript.preferences.importModuleSpecifier: non-relative` to
`.vscode/settings.json` (TypeScript setting was already there)

### Code Fixes
- Fixed **941 relative parent imports** across **706 files** in
`packages/twenty-front`
- All `../` imports converted to use `@/` alias

## Why
- Consistent import style across the codebase
- Easier to move files without breaking imports
- Better IDE support for auto-imports
- Clearer understanding of where imports come from

packages/twenty-front/src/modules/workflow/workflow-steps/hooks/__tests__/useCreateStep.test.tsx

@@ -1,7 +1,7 @@
 import { act, renderHook } from '@testing-library/react';
 import { RecoilRoot } from 'recoil';
-import { WorkflowVisualizerComponentInstanceContext } from '../../../workflow-diagram/states/contexts/WorkflowVisualizerComponentInstanceContext';
-import { useCreateStep } from '../useCreateStep';
+import { WorkflowVisualizerComponentInstanceContext } from '@/workflow/workflow-diagram/states/contexts/WorkflowVisualizerComponentInstanceContext';
+import { useCreateStep } from '@/workflow/workflow-steps/hooks/useCreateStep';
 
 const mockGetUpdatableWorkflowVersion = jest.fn();
 const mockCreateWorkflowVersionStep = jest.fn().mockResolvedValue({

packages/twenty-front/src/modules/workflow/workflow-steps/hooks/__tests__/useDeleteStep.test.tsx

@@ -3,7 +3,7 @@ import React from 'react';
 import { useDeleteStep } from '@/workflow/workflow-steps/hooks/useDeleteStep';
 import { renderHook } from '@testing-library/react';
 import { RecoilRoot } from 'recoil';
-import { WorkflowVisualizerComponentInstanceContext } from '../../../workflow-diagram/states/contexts/WorkflowVisualizerComponentInstanceContext';
+import { WorkflowVisualizerComponentInstanceContext } from '@/workflow/workflow-diagram/states/contexts/WorkflowVisualizerComponentInstanceContext';
 
 const mockDeleteWorkflowVersionStep = jest.fn();
 const mockGetUpdatableWorkflowVersion = jest.fn();

packages/twenty-front/src/modules/workflow/workflow-steps/hooks/__tests__/useDuplicateStep.test.tsx

@@ -1,7 +1,7 @@
 import { useDuplicateStep } from '@/workflow/workflow-steps/hooks/useDuplicateStep';
 import { act, renderHook } from '@testing-library/react';
 import { RecoilRoot } from 'recoil';
-import { WorkflowVisualizerComponentInstanceContext } from '../../../workflow-diagram/states/contexts/WorkflowVisualizerComponentInstanceContext';
+import { WorkflowVisualizerComponentInstanceContext } from '@/workflow/workflow-diagram/states/contexts/WorkflowVisualizerComponentInstanceContext';
 
 const mockGetUpdatableWorkflowVersion = jest.fn();
 const mockDuplicateWorkflowVersionStep = jest.fn().mockResolvedValue({

packages/twenty-front/src/modules/workflow/workflow-steps/hooks/__tests__/useUpdateAgentLabel.test.tsx

@@ -1,5 +1,5 @@
 import { renderHook } from '@testing-library/react';
-import { useUpdateAgentLabel } from '../useUpdateAgentLabel';
+import { useUpdateAgentLabel } from '@/workflow/workflow-steps/hooks/useUpdateAgentLabel';
 
 const mockUpdateAgent = jest.fn();
 const mockUseFindOneAgentQuery = jest.fn();

packages/twenty-front/src/modules/workflow/workflow-steps/hooks/useWorkflowRunStepInfo.ts

@@ -3,7 +3,7 @@ import { useRecoilComponentValue } from '@/ui/utilities/state/component-state/ho
 import { useWorkflowRun } from '@/workflow/hooks/useWorkflowRun';
 import { useWorkflowRunIdOrThrow } from '@/workflow/hooks/useWorkflowRunIdOrThrow';
 import { isDefined } from 'twenty-shared/utils';
-import { getStepInfoHistoryItem } from '../utils/getStepInfoHistoryItem';
+import { getStepInfoHistoryItem } from '@/workflow/workflow-steps/utils/getStepInfoHistoryItem';
 
 export const useWorkflowRunStepInfo = ({ stepId }: { stepId: string }) => {
   const workflowRunId = useWorkflowRunIdOrThrow();