## 1. Fix Theme Store Initialization Order
- [x] 1.1 Initialize Pinia before using themeStore in main.js
- [x] 1.2 Verify that the `ReferenceError: Cannot access 'themeStore' before initialization` error is resolved

## 2. Fix Sass @import Deprecation Warnings
- [x] 2.1 Replace @import with @use in main.scss for variables.scss
- [x] 2.2 Replace @import with @use in main.scss for responsive.scss
- [x] 2.3 Verify that no Sass deprecation warnings appear during build

## 3. Add Best Practices Documentation
- [x] 3.1 Create implementation.md with best practices for frontend development
- [x] 3.2 Document the importance of store initialization order
- [x] 3.3 Document the use of @use instead of @import for Sass files

## 4. Verification
- [x] 4.1 Run build command to verify no warnings or errors
- [x] 4.2 Test application functionality to ensure no regressions