Implement Svelte playground project

[Reversean]

Create a minimal, focused playground that demonstrates how @hawk.so/javascript catches different types of errors in Svelte applications.

Tasks

• Initialize minimal SvelteKit playground at /packages/svelte/playground
• Configure @hawk.so/javascript as workspace dependency
• Add HawkCatcher configuration
• Implement test pages for Global Error Handlers
• Implement test page for Svelte Error Boundaries
• Create homepage with navigation to all error test pages
• Add comprehensive README.md explaining setup and installation, Hawk integration details, error triggers.

Acceptance Criteria

• Playground starts successfully with yarn dev
• @hawk.so/javascript can be imported and initializes without errors
• Each test page clearly demonstrates one specific error triggering pattern
• README provides complete documentation for setup and usage