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/utils/__tests__/findStepPosition.test.ts

@@ -1,6 +1,6 @@
 import { type WorkflowStep } from '@/workflow/types/Workflow';
 import { TRIGGER_STEP_ID } from 'twenty-shared/workflow';
-import { findStepPosition } from '../findStepPosition';
+import { findStepPosition } from '@/workflow/utils/findStepPosition';
 
 describe('findStepPosition', () => {
   const mockSteps: WorkflowStep[] = [

packages/twenty-front/src/modules/workflow/utils/__tests__/getAgentIdFromStep.test.ts

@@ -1,4 +1,4 @@
-import { getAgentIdFromStep } from '../getAgentIdFromStep';
+import { getAgentIdFromStep } from '@/workflow/utils/getAgentIdFromStep';
 
 describe('getAgentIdFromStep', () => {
   it('should return undefined when stepDefinition is undefined', () => {

packages/twenty-front/src/modules/workflow/utils/__tests__/getStepDefinitionOrThrow.test.ts

@@ -3,7 +3,7 @@ import {
   type WorkflowTrigger,
 } from '@/workflow/types/Workflow';
 import { TRIGGER_STEP_ID } from 'twenty-shared/workflow';
-import { getStepDefinitionOrThrow } from '../getStepDefinitionOrThrow';
+import { getStepDefinitionOrThrow } from '@/workflow/utils/getStepDefinitionOrThrow';
 
 describe('getStepDefinitionOrThrow', () => {
   const mockTrigger: WorkflowTrigger = {

packages/twenty-front/src/modules/workflow/utils/__tests__/getStepOutputSchemaFamilyStateKey.test.ts

@@ -1,4 +1,4 @@
-import { getStepOutputSchemaFamilyStateKey } from '../getStepOutputSchemaFamilyStateKey';
+import { getStepOutputSchemaFamilyStateKey } from '@/workflow/utils/getStepOutputSchemaFamilyStateKey';
 
 describe('getStepOutputSchemaFamilyStateKey', () => {
   it('should concatenate workflowVersionId and stepId with a dash', () => {

packages/twenty-front/src/modules/workflow/utils/__tests__/getWorkflowVisualizerComponentInstanceId.test.ts

@@ -1,4 +1,4 @@
-import { getWorkflowVisualizerComponentInstanceId } from '../getWorkflowVisualizerComponentInstanceId';
+import { getWorkflowVisualizerComponentInstanceId } from '@/workflow/utils/getWorkflowVisualizerComponentInstanceId';
 
 describe('getWorkflowVisualizerComponentInstanceId', () => {
   it('should return the same recordId that was passed in', () => {

packages/twenty-front/src/modules/workflow/utils/__tests__/isStandaloneVariableString.test.ts

@@ -1,4 +1,4 @@
-import { isStandaloneVariableString } from '../isStandaloneVariableString';
+import { isStandaloneVariableString } from '@/workflow/utils/isStandaloneVariableString';
 
 it('returns false if the provided value is not a string', () => {
   expect(isStandaloneVariableString(42)).toBe(false);

packages/twenty-front/src/modules/workflow/utils/__tests__/parseAndValidateVariableFriendlyStringifiedJson.test.ts

@@ -1,4 +1,4 @@
-import { parseAndValidateVariableFriendlyStringifiedJson } from '../parseAndValidateVariableFriendlyStringifiedJson';
+import { parseAndValidateVariableFriendlyStringifiedJson } from '@/workflow/utils/parseAndValidateVariableFriendlyStringifiedJson';
 
 describe('parseAndValidateVariableFriendlyStringifiedJson', () => {
   describe('Valid JSON with variable-friendly keys', () => {

packages/twenty-front/src/modules/workflow/utils/__tests__/splitWorkflowTriggerEventName.test.ts

@@ -1,4 +1,4 @@
-import { splitWorkflowTriggerEventName } from '../splitWorkflowTriggerEventName';
+import { splitWorkflowTriggerEventName } from '@/workflow/utils/splitWorkflowTriggerEventName';
 
 describe('splitWorkflowTriggerEventName', () => {
   it('should split a basic event name into objectType and event', () => {