Add biome checks

[nairmanu]

No description provided.

[Copilot]

Pull Request Overview

This PR sets up Biome as a linting and formatting tool for the project, including configuration, workflow integration, and fixes for linting issues discovered.

• Adds Biome linter/formatter with comprehensive configuration
• Integrates Biome checks into GitHub Actions PR workflow
• Fixes existing code issues identified by the linter (unused import, incorrect semicolon)

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
yarn.lock	Adds @biomejs/biome v1.9.4 and its platform-specific dependencies
package.json	Adds Biome scripts (lint, format, check) and devDependency
biome.json	Configures Biome linter rules, file patterns, and formatting preferences
.github/workflows/pr-check.yml	Creates new PR check workflow with lint, build, test, and size checks
packages/clarity-visualize/src/layout.ts	Fixes syntax error: replaces incorrect semicolon with closing brace
packages/clarity-js/test/helper.ts	Removes unused import "decode" from clarity-decode

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