feat(typography): migrate from Google Fonts to local font hosting

feat(typography): migrate from Google Fonts to local font hosting

Replaced external Google Fonts integration with locally hosted font files
for Oswald and Roboto.

- Added local @font-face definitions for Oswald (400, 500, 700)
- Added local @font-face definitions for Roboto (400, 500, 700)
- Removed Google Fonts enqueue and external requests
- Implemented unicode-range optimized font loading (latin subset)
- Fixed font file path inconsistencies causing fallback rendering
- Ensured correct font-weight mapping across all variants
- Maintained existing typography system via CSS variables

Result:
- No external font requests (fonts.googleapis.com / fonts.gstatic.com removed)
- Improved performance and privacy (GDPR compliant)
- Consistent rendering with original Google Fonts appearance
- Full control over font loading and optimization

This commit is contained in: