Set up coverage reporting

[porada]

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[codecov]

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[Copilot]

Pull request overview

This pull request sets up coverage reporting for the project using Codecov integration. It configures strict coverage thresholds in Vitest and adds a GitHub Actions workflow to automatically upload coverage reports.

Changes:

• Configured Vitest with 100% coverage thresholds for branches, functions, and statements
• Updated pnpm package manager from version 10.27.0 to 10.28.0
• Added Codecov badge to README and updated npm version badge styling

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
vitest.config.ts	Added coverage thresholds configuration requiring 100% coverage for branches, functions, and statements
package.json	Updated package manager version from pnpm@10.27.0 to pnpm@10.28.0
README.md	Added Codecov badge and removed color parameter from npm version badge
.github/workflows/verify.yaml	Added new coverage job that runs tests with coverage and uploads results to Codecov

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