Describe the bug

One of the nice features of the UI mode is the module graph view, however, when the UI mode is used with --merge-reports, the module graph view only shows the test file, whereas I would expect it to also include all the files used by the test file.

Reproduction

StackBlitz reproduction link, select a test file in the UI, and navigate to the Module Graph tab. The modules graph only shows the test files, without the other files used by it.

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 20.19.1 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 10.8.2 - /usr/local/bin/npm
    pnpm: 8.15.6 - /usr/local/bin/pnpm
  npmPackages:
    @vitest/ui: latest => 3.2.4 
    vite: latest => 7.1.9 
    vitest: latest => 3.2.4

Used Package Manager

npm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.