Update CI: Argos visual regression for twenty-front storybook (#21454)

## What

Adds Argos visual regression for `twenty-front`, reusing the storybook
CI already builds and the existing sharded test matrix. Stories in the
`modules` and `pages` scopes are captured as PNGs during
`front-sb-test`, merged into one artifact, and pixel-diffed against
`main` on the self-hosted Argos with results posted as a PR comment —
same pipeline as `twenty-ui` (#21210 / #21262).

## How

- **Capture**: `@argos-ci/storybook` vitest plugin, same setup as
`twenty-ui`. Skipped for `performance` stories (nondeterministic
profiling reports). Freezes framer-motion to avoid flaky diffs (#21412).
- **Sharding**: each modules/pages shard uploads a partial artifact; a
new `front-sb-screenshots` job merges them into
`argos-screenshots-twenty-front` (`overwrite: true` so re-runs work).
- **Baselines**: `CI Front` now runs on `push: main` — Argos resolves
base builds by exact merge-base commit, so every main commit needs a
build (#21217/#21222 pattern). Main pushes get a per-SHA concurrency
group so back-to-back merges can't cancel queued runs and leave baseline
gaps; the `performance` scope is dropped on push.
- **Dispatch**: `visual-regression-dispatch.yaml` watches `CI Front` →
`project=twenty-front`.

## Rollout

- ✅ Prod Argos project `twenty-front` created (id 68) +
`ARGOS_TOKEN_FRONT` secret set
- ⬜ Merge the twentyhq/ci-privileged companion PR **before** this one
- First PR builds show as *orphan* until the first main push creates a
baseline
  (expected, same as the twenty-ui rollout)

packages/twenty-front/src/modules/workflow/components/__stories__/WorkflowStepExecutionResult.stories.tsx

@@ -1,6 +1,7 @@
 import { type Meta, type StoryObj } from '@storybook/react-vite';
 import { ComponentDecorator } from 'twenty-ui-deprecated/testing';
 
+import { ARGOS_CAPTURE_DISABLED } from '~/testing/constants/ArgosCaptureDisabled';
 import { SnackBarDecorator } from '~/testing/decorators/SnackBarDecorator';
 
 import { WorkflowStepExecutionResult } from '@/workflow/components/WorkflowStepExecutionResult';
@@ -9,6 +10,9 @@ const meta: Meta<typeof WorkflowStepExecutionResult> = {
   title: 'Modules/Workflow/Components/StepExecutionResult',
   component: WorkflowStepExecutionResult,
   decorators: [ComponentDecorator, SnackBarDecorator],
+  parameters: {
+    argos: ARGOS_CAPTURE_DISABLED,
+  },
   args: {
     result: JSON.stringify(
       { message: 'Hello World', status: 'success' },