We need to migrate the project to Svelte 5, adopting the new Rune syntax and features.

📋 Tasks

• Create a new branch for the migration (e.g., svelte-5-migration)
• Upgrade all dependencies to support Svelte 5
• Replace $: reactive labels with @reactive runes
• Refactor reactive stores to use runes/store
• Update component logic to align with Svelte 5 best practices
• Remove deprecated APIs and patterns
• Update build tools and configurations (e.g., Vite, Rollup)
• Update tests to ensure compatibility with new syntax
• Open a PR for development and testing

📚 Resources

• [Svelte 5 Migration Guide](https://svelte.dev/docs/svelte/v5-migration-guide)

✅ Acceptance Criteria

• App builds successfully with Svelte 5
• All components and logic are converted to use Rune syntax
• No breaking changes in user experience
• All tests pass
• PR is open for review and testing