Setup frontend — fonts, SCSS structure, header scroll animation

- Add Bartok font-faces (Regular, Poster, Highlight)
- Structure SCSS with reset, variables, global, header, home partials
- Build fixed header with characters SVG and scroll-driven offset animation
- Add home template wiring snippets
- Update .gitignore to track src/ and exclude local/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/css/style.scss

@@ -0,0 +1,6 @@
+@import "src/reset";
+@import "src/fonts";
+@import "src/variables";
+@import "src/global";
+@import "src/header";
+@import "src/pages/home";