Fix vitest.config.mts for Vitest 4 compatibility

[Claude]

The vitest configuration was using deprecated poolOptions.threads structure incompatible with Vitest 4, causing configuration warnings and potential test execution issues.

Changes

• Migrated isolate and singleThread options from nested poolOptions.threads to top-level test configuration
• Aligns with Vitest 4 migration guide requirement that all pool options are now top-level

Before:

pool: 'threads',
poolOptions: {
  threads: {
    isolate: false,
    singleThread: false,
  },
},

After:

pool: 'threads',
isolate: false,
singleThread: false,

This eliminates the deprecation warning and ensures proper test isolation behavior across the monorepo's test suite.

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Project	Deployment	Actions	Updated (UTC)
objectui-demo	Ready	Preview, Comment	Apr 23, 2026 1:53pm

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Project	Deployment	Actions	Updated (UTC)
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