Refactor components to use InlineSvg for icons, enhance Header layout with grid, and implement achievement system in FlagQuiz page

- Replaced inline SVGs with InlineSvg component in Filter, Header, and ThemeSwitcher components for better maintainability.
- Improved Header layout using CSS Grid for better alignment and spacing of elements.
- Added achievement tracking and display functionality in FlagQuiz, including reset confirmation dialog and achievement count updates.
- Enhanced user feedback with animated result icons in FlagQuiz for correct and wrong answers.
- Introduced country info tooltips in FlagQuiz for additional context on answers.

public/icons/filter.svg

@@ -0,0 +1,3 @@
+<svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M20.058 9.72255C21.0065 9.18858 21.4808 8.9216 21.7404 8.49142C22 8.06124 22 7.54232 22 6.50448V5.81466C22 4.48782 22 3.8244 21.5607 3.4122C21.1213 3 20.4142 3 19 3H5C3.58579 3 2.87868 3 2.43934 3.4122C2 3.8244 2 4.48782 2 5.81466V6.50448C2 7.54232 2 8.06124 2.2596 8.49142C2.5192 8.9216 2.99347 9.18858 3.94202 9.72255L6.85504 11.3624C7.49146 11.7206 7.80967 11.8998 8.03751 12.0976C8.51199 12.5095 8.80408 12.9935 8.93644 13.5872C9 13.8722 9 14.2058 9 14.8729L9 17.5424C9 18.452 9 18.9067 9.25192 19.2613C9.50385 19.6158 9.95128 19.7907 10.8462 20.1406C12.7248 20.875 13.6641 21.2422 14.3321 20.8244C15 20.4066 15 19.4519 15 17.5424V14.8729C15 14.2058 15 13.8722 15.0636 13.5872C15.1959 12.9935 15.488 12.5095 15.9625 12.0976" stroke="currentColor" stroke-width="1.5" stroke-linecap="round"/>
+</svg>