feat: Add loading SVG icon and integrate Iconify for dynamic icon management

- Integrated Iconify plugin into the main application for icon management.
- Created a new plugin to automatically generate Iconify JSON from SVG files.
- Implemented a watcher to regenerate icons on file changes during development.
- Added a build validator plugin to ensure icons are generated and TypeScript checks are passed before build.
- Updated Vite configuration to include the new plugins.