Subpath import of `@vitest/browser/context` from `@storybook/addon-vitest` fails.

[hwld]

Describe the bug

@storybook/addon-vitest internally imports @vitest/browser/context within test-utils.js. This import fails when running Storybook's browser tests using vp test.

This is similar to #894, but it differs in that vp migrate cannot fix it because the import comes from an external library.

Reproduction

https://github.com/hwld/vite-plus-vitest-browser-context-repro/tree/storybook-repro

Steps to reproduce

git clone https://github.com/hwld/vite-plus-vitest-browser-context-repro.git
cd vite-plus-vitest-browser-context-repro
git switch storybook-repro
vp install
vp exec playwright install --with-deps chromium
vp test

It also reproduces on GitHub Actions:
https://github.com/hwld/vite-plus-vitest-browser-context-repro/actions/runs/23143549750/job/67225684325

System Info

VITE+ - The Unified Toolchain for the Web

Environment:
  Version  24.14.0
  Source   lts

Tool Paths:
  node  /Users/hwld/.vite-plus/js_runtime/node/24.14.0/bin/node
  npm   /Users/hwld/.vite-plus/js_runtime/node/24.14.0/bin/npm
  npx   /Users/hwld/.vite-plus/js_runtime/node/24.14.0/bin/npx
---
VITE+ - The Unified Toolchain for the Web

vp v0.1.12

Local vite-plus:
  vite-plus  v0.1.12

Tools:
  vite             v8.0.0
  rolldown         v1.0.0-rc.9
  vitest           v4.1.0
  oxfmt            v0.40.0
  oxlint           v1.55.0
  oxlint-tsgolint  v0.17.0
  tsdown           v0.21.3

Environment:
  Package manager  pnpm v10.32.1
  Node.js          Not found

Used Package Manager

pnpm

Logs

Pre-transform error: Failed to load url .../vite-plus-test/dist/@vitest/browser/@vitest/browser/context.js

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue for the same bug.
• Confirm this is a Vite+ issue and not an upstream issue (Vite, Vitest, tsdown, Rolldown, or Oxc).
• The provided reproduction is a minimal reproducible example.