chore: upgrade vitest from v3 to v4

[fengmk2]

• Update vitest and related packages to 4.0.15
• Migrate workspace config to use projects array (defineWorkspace -> defineConfig with test.projects)
• Remove deprecated coverage.all option
• Migrate poolOptions.forks.singleFork to maxWorkers/isolate options
• Fix incorrect import of afterEach from node:test in utils.spec.ts

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated Vitest testing framework dependencies to version 4.0.15 across the project.
  • Updated Vitest configuration to use new API patterns and worker/isolation settings.
  • Cleaned up test configuration imports and settings for consistency.

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Walkthrough

This PR upgrades Vitest from v3.1.3 to v4.0.15, updates test configuration files to align with Vitest 4's new APIs (replacing poolOptions with maxWorkers/isolate settings, switching from defineWorkspace to defineConfig), removes redundant coverage settings, and consolidates imports.

Changes

Cohort / File(s)	Summary
Vitest dependency upgrade package.json	Updates @vitest/browser, @vitest/coverage-istanbul, @vitest/ui, and vitest from 3.1.3 to 4.0.15 in devDependencies.
Vitest configuration migration vitest.config.ts, vitest.workspace.ts, packages/frontend/apps/electron/vitest.config.ts	Vitest 4.0 API changes: replaces poolOptions.forks.singleFork with maxWorkers/isolate settings; switches workspace config from defineWorkspace() to defineConfig() with nested test.projects structure; removes explicit coverage.all: false setting.
Test file import consolidation packages/frontend/core/src/modules/navigation/__tests__/utils.spec.ts	Merges separate node:test and vitest imports into a single vitest import statement.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20–25 minutes

• Vitest 4.0 configuration API changes: The poolOptions to maxWorkers/isolate migration and defineWorkspace to defineConfig refactor require verification of behavioral equivalence and confirmation that test execution remains correct.
• Coverage configuration removal: Verify that removal of coverage.all: false doesn't alter intended coverage reporting behavior under the new version.
• Test file consolidation: Confirm that the import consolidation doesn't introduce unintended runtime changes (although unlikely for this case).

Poem

🐰 From version three to four we leap, New configs help the tests run deep, With workers pooling all our might, And workspaces configured just right, Vitest hops toward the light! 🐇✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: upgrading Vitest from v3 to v4, which is reflected across all modified files including dependency bumps, config migrations, and API updates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 47.78%. Comparing base (bcc892c) to head (9537b0a).

Additional details and impacted files

@@            Coverage Diff             @@
##           canary   #14045      +/-   ##
==========================================
- Coverage   57.15%   47.78%   -9.38%     
==========================================
  Files        2757     2184     -573     
  Lines      137728   115975   -21753     
  Branches    21155    15466    -5689     
==========================================
- Hits        78724    55420   -23304     
- Misses      56776    59932    +3156     
+ Partials     2228      623    -1605     

Flag	Coverage Δ
server-test	77.29% <ø> (-1.18%)	:arrow_down:
unittest	14.33% <ø> (-17.66%)	:arrow_down:

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