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/page-layout/widgets/components/WidgetActionFieldEdit.tsx

@@ -22,7 +22,7 @@ import { getObjectPermissionsFromMapByObjectMetadataId } from '@/settings/roles/
 import { useLayoutRenderingContext } from '@/ui/layout/contexts/LayoutRenderingContext';
 import { useTargetRecord } from '@/ui/layout/contexts/useTargetRecord';
 import { assertIsDefinedOrThrow } from 'twenty-shared/utils';
-import { useCurrentWidget } from '../hooks/useCurrentWidget';
+import { useCurrentWidget } from '@/page-layout/widgets/hooks/useCurrentWidget';
 
 export const WidgetActionFieldEdit = () => {
   const widget = useCurrentWidget();

packages/twenty-front/src/modules/page-layout/widgets/components/WidgetActionRenderer.tsx

@@ -1,7 +1,7 @@
 import { type WidgetAction } from '@/page-layout/widgets/types/WidgetAction';
 import { CustomError } from 'twenty-shared/utils';
 import { WidgetType } from '~/generated/graphql';
-import { useCurrentWidget } from '../hooks/useCurrentWidget';
+import { useCurrentWidget } from '@/page-layout/widgets/hooks/useCurrentWidget';
 import { WidgetActionFieldEdit } from './WidgetActionFieldEdit';
 
 type WidgetActionRendererProps = {