Vite vitest dependency versions

[kentcdodds]

Summary

Updated Vite, Vitest, and related plugins/coverage dependencies to their latest versions.

Test Plan

Ran npm test -- --run to verify Vitest runs correctly after dependency updates. No manual UI testing was performed as there are no UI changes.

Checklist

• Tests updated
• Docs updated

Screenshots

No UI changes, so no screenshots are needed.

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Note

Medium Risk
Moderate risk due to major-version upgrades of core build/test tooling (Vite/Vitest) which can introduce breaking changes in bundling, dev server behavior, or test/coverage output.

Overview
Upgrades the frontend build/test toolchain to newer major versions: vite from v5 to v7 and vitest from v2 to v4, along with corresponding updates to @vitejs/plugin-react and @vitest/coverage-v8 (reflected in package.json/package-lock.json).

Adjusts vitest.config.ts for the new Vitest config entrypoint (defineConfig now imported from vitest/config) and simplifies coverage settings by dropping the all: true option.

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Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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