Migrate from ESLint to OxLint (#18443)

## Summary

Fully replaces ESLint with OxLint across the entire monorepo:

- **Replaced all ESLint configs** (`eslint.config.mjs`) with OxLint
configs (`.oxlintrc.json`) for every package: `twenty-front`,
`twenty-server`, `twenty-emails`, `twenty-ui`, `twenty-shared`,
`twenty-sdk`, `twenty-zapier`, `twenty-docs`, `twenty-website`,
`twenty-apps/*`, `create-twenty-app`
- **Migrated custom lint rules** from ESLint plugin format to OxLint JS
plugin system (`@oxlint/plugins`), including
`styled-components-prefixed-with-styled`, `no-hardcoded-colors`,
`sort-css-properties-alphabetically`,
`graphql-resolvers-should-be-guarded`,
`rest-api-methods-should-be-guarded`, `max-consts-per-file`, and
Jotai-related rules
- **Migrated custom rule tests** from ESLint `RuleTester` + Jest to
`oxlint/plugins-dev` `RuleTester` + Vitest
- **Removed all ESLint dependencies** from `package.json` files and
regenerated lockfiles
- **Updated Nx targets** (`lint`, `lint:diff-with-main`, `fmt`) in
`nx.json` and per-project `project.json` to use `oxlint` commands with
proper `dependsOn` for plugin builds
- **Updated CI workflows** (`.github/workflows/ci-*.yaml`) — no more
ESLint executor
- **Updated IDE setup**: replaced `dbaeumer.vscode-eslint` with
`oxc.oxc-vscode` extension, configured `source.fixAll.oxc` and
format-on-save with Prettier
- **Replaced all `eslint-disable` comments** with `oxlint-disable`
equivalents across the codebase
- **Updated docs** (`twenty-docs`) to reference OxLint instead of ESLint
- **Renamed** `twenty-eslint-rules` package to `twenty-oxlint-rules`

### Temporarily disabled rules (tracked in `OXLINT_MIGRATION_TODO.md`)

| Rule | Package | Violations | Auto-fixable |
|------|---------|-----------|-------------|
| `twenty/sort-css-properties-alphabetically` | twenty-front | 578 | Yes
|
| `typescript/consistent-type-imports` | twenty-server | 3814 | Yes |
| `twenty/max-consts-per-file` | twenty-server | 94 | No |

### Dropped plugins (no OxLint equivalent)

`eslint-plugin-project-structure`, `lingui/*`, `@stylistic/*`,
`import/order`, `prefer-arrow/prefer-arrow-functions`,
`eslint-plugin-mdx`, `@next/eslint-plugin-next`,
`eslint-plugin-storybook`, `eslint-plugin-react-refresh`. Partial
coverage for `jsx-a11y` and `unused-imports`.

### Additional fixes (pre-existing issues exposed by merge)

- Fixed `EmailThreadPreview.tsx` broken import from main rename
(`useOpenEmailThreadInSidePanel`)
- Restored truthiness guard in `getActivityTargetObjectRecords.ts`
- Fixed `AgentTurnResolver` return types to match entity (virtual
`fileMediaType`/`fileUrl` are resolved via `@ResolveField()`)

## Test plan

- [x] `npx nx lint twenty-front` passes
- [x] `npx nx lint twenty-server` passes
- [x] `npx nx lint twenty-docs` passes
- [x] Custom oxlint rules validated with Vitest: `npx nx test
twenty-oxlint-rules`
- [x] `npx nx typecheck twenty-front` passes
- [x] `npx nx typecheck twenty-server` passes
- [x] CI workflows trigger correctly with `dependsOn:
["twenty-oxlint-rules:build"]`
- [x] IDE linting works with `oxc.oxc-vscode` extension

packages/twenty-front/src/modules/object-record/hooks/useAggregateRecords.ts

@@ -48,7 +48,7 @@ export const useAggregateRecords = <T extends AggregateRecordsData>({
   const { data, loading, error } = useQuery<RecordGqlOperationFindManyResult>(
     aggregateQuery,
     {
-      skip: skip || !objectMetadataItem || !hasReadPermission,
+      skip: skip || !isDefined(objectMetadataItem) || !hasReadPermission,
       variables: {
         filter,
       },

packages/twenty-front/src/modules/object-record/hooks/useCreateManyRecords.ts

@@ -142,26 +142,30 @@ export const useCreateManyRecords = <
       }
     });
 
-    const recordsCreatedInCache = recordOptimisticRecordsInput
-      .map((recordToCreate) =>
-        createOneRecordInCache({
+    const recordsCreatedInCache = recordOptimisticRecordsInput.flatMap(
+      (recordToCreate) => {
+        const created = createOneRecordInCache({
           ...recordToCreate,
           __typename: getObjectTypename(objectMetadataItem.nameSingular),
-        }),
-      )
-      .filter(isDefined);
+        });
+
+        return created !== undefined && created !== null ? [created] : [];
+      },
+    );
 
     if (recordsCreatedInCache.length > 0) {
-      const recordNodeCreatedInCache = recordsCreatedInCache
-        .map((record) =>
-          getRecordNodeFromRecord({
+      const recordNodeCreatedInCache = recordsCreatedInCache.flatMap(
+        (record) => {
+          const node = getRecordNodeFromRecord({
             objectMetadataItem,
             objectMetadataItems,
             record: record,
             computeReferences: false,
-          }),
-        )
-        .filter(isDefined);
+          });
+
+          return node !== undefined && node !== null ? [node] : [];
+        },
+      );
 
       triggerCreateRecordsOptimisticEffect({
         cache: apolloCoreClient.cache,

packages/twenty-front/src/modules/object-record/hooks/useCreateOneRecord.ts

@@ -162,7 +162,7 @@ export const useCreateOneRecord = <
         },
       })
       .catch((error: Error) => {
-        if (!recordCreatedInCache) {
+        if (!isDefined(recordCreatedInCache)) {
           throw error;
         }
 

packages/twenty-front/src/modules/object-record/hooks/useFindDuplicateRecords.ts

@@ -1,4 +1,5 @@
 import { useQuery } from '@apollo/client';
+import { isDefined } from 'twenty-shared/utils';
 import { useMemo } from 'react';
 
 import { useApolloCoreClient } from '@/object-metadata/hooks/useApolloCoreClient';
@@ -70,7 +71,7 @@ export const useFindDuplicateRecords = <T extends ObjectRecord = ObjectRecord>({
   const results = useMemo(
     () =>
       objectResults?.map((result: RecordGqlConnectionEdgesRequired) => {
-        return result
+        return isDefined(result)
           ? (getRecordsFromRecordConnection({
               recordConnection: result,
             }) as T[])

packages/twenty-front/src/modules/object-record/hooks/useFindManyRecords.ts

@@ -1,4 +1,5 @@
 import { useQuery, type WatchQueryFetchPolicy } from '@apollo/client';
+import { isDefined } from 'twenty-shared/utils';
 
 import { useApolloCoreClient } from '@/object-metadata/hooks/useApolloCoreClient';
 import { useObjectMetadataItem } from '@/object-metadata/hooks/useObjectMetadataItem';
@@ -89,7 +90,7 @@ export const useFindManyRecords = <T extends ObjectRecord = ObjectRecord>({
 
   const { data, loading, error, fetchMore, refetch } =
     useQuery<RecordGqlOperationFindManyResult>(findManyRecordsQuery, {
-      skip: skip || !objectMetadataItem || !hasReadPermission,
+      skip: skip || !isDefined(objectMetadataItem) || !hasReadPermission,
       variables: {
         filter: withSoftDeleteFilter,
         orderBy,

packages/twenty-front/src/modules/object-record/hooks/useFindOneRecord.ts

@@ -56,7 +56,7 @@ export const useFindOneRecord = <T extends ObjectRecord = ObjectRecord>({
   const { data, loading, error, refetch } = useQuery<{
     [nameSingular: string]: RecordGqlNode;
   }>(findOneRecordQuery, {
-    skip: !objectMetadataItem || !objectRecordId || skip || !hasReadPermission,
+    skip: !isDefined(objectMetadataItem) || !objectRecordId || skip || !hasReadPermission,
     variables: { objectRecordId },
     client: apolloCoreClient,
     onCompleted: (data) => {