chore(twenty-front): migrate auth, activities, AI, pages and small modules from Emotion to Linaria (PR 2-3/10) (#18328)

## Summary

- Migrate ~200 files from `@emotion/styled` / `@emotion/react` to
`@linaria/react` + `themeCssVariables`, continuing the zero-runtime
CSS-in-JS migration (PR 2-3 of the [migration
plan](docs/emotion-to-linaria-migration-plan.md))
- Modules covered: **auth** (19), **activities** (53), **ai** (30),
**pages** (70), **action-menu** (3), **object-metadata** (4),
**onboarding** (2), **workspace** (2), **file** (3), **error-handler**
(2), **front-components** (1), **geo-map** (1), **loading** (5),
**testing** (5), plus a `style` prop addition to `TableRow`
- Handles `styled(FunctionComponent)<Props>` incompatibility with
Linaria by using CSS custom properties via `style` + `var()` references

## Test plan

- [x] `npx nx lint:diff-with-main twenty-front` passes
- [x] `npx nx typecheck twenty-front` passes
- [ ] Visual spot-check of auth, onboarding, settings, activities, and
AI chat screens
- [ ] No remaining `@emotion/styled` or `@emotion/react` imports in
migrated files


Made with [Cursor](https://cursor.com)

packages/twenty-front/src/modules/front-components/components/FrontComponentRenderer.tsx

@@ -5,11 +5,11 @@ import { frontComponentApplicationTokenPairComponentState } from '@/front-compon
 import { getFrontComponentUrl } from '@/front-components/utils/getFrontComponentUrl';
 import { useSnackBar } from '@/ui/feedback/snack-bar-manager/hooks/useSnackBar';
 import { useSetAtomComponentState } from '@/ui/utilities/state/jotai/hooks/useSetAtomComponentState';
-import { useTheme } from '@emotion/react';
 import { t } from '@lingui/core/macro';
-import { useCallback } from 'react';
+import { useCallback, useContext } from 'react';
 import { FrontComponentRenderer as SharedFrontComponentRenderer } from 'twenty-sdk/front-component-renderer';
 import { isDefined } from 'twenty-shared/utils';
+import { ThemeContext } from 'twenty-ui/theme';
 import { REACT_APP_SERVER_BASE_URL } from '~/config';
 import { useFindOneFrontComponentQuery } from '~/generated-metadata/graphql';
 
@@ -20,7 +20,7 @@ type FrontComponentRendererProps = {
 export const FrontComponentRenderer = ({
   frontComponentId,
 }: FrontComponentRendererProps) => {
-  const theme = useTheme();
+  const { theme } = useContext(ThemeContext);
   const { enqueueErrorSnackBar } = useSnackBar();
 
   const setFrontComponentApplicationTokenPair = useSetAtomComponentState(