* feat: add i18n support with separate translation files
- Extract translations from store.js to separate files for easier management
- Add translation files for English (en.js), Indonesian (id.js), Turkish (tr.js), and Chinese (zh.js)
- Load translations via window.translations object before Alpine store initialization
- Add Bahasa Indonesia option to language selector
* feat: translate remaining hardcoded UI strings
- Update index.html to use t() for Menu and GitHub labels
- Update views to translate Tier, Quota, Live, tier badges, and close button
- Update components to use translated error messages and confirmation dialogs
- Update utils to use translated validation and error messages
- Update app-init.js to use translated OAuth success/error messages
- Replace Tailwind CDN with local build (PostCSS + autoprefixer + daisyui)
- Add CSS build scripts with automatic prepare hook on npm install
- Create account-actions.js service layer with unified response format
- Extend ErrorHandler.withLoading() for automatic loading state management
- Add skeleton screens for initial load, silent refresh for subsequent updates
- Implement loading animations for async operations (buttons, modals)
- Improve empty states and add ARIA labels for accessibility
- Abstract component styles using @apply (buttons, badges, inputs)
- Add JSDoc documentation for Dashboard modules
- Update README and CLAUDE.md with development guidelines
