Refactor math chapter structure and styling: Update .gitignore to exclude specific CSS directories, enhance CONTRIBUTING.md with new guidelines for subject-specific assets, and streamline chapter content organization. Modify curriculum data to include new chapter dependencies and improve frontend logic for loading shared styles and scripts. Adjust styles for better visual consistency across math chapters.

frontend/src/main.tsx

@@ -134,7 +134,21 @@ if (chapterNavRoot) {
   });
 }
 
+function mountSubjectInit() {
+  const article = document.querySelector<HTMLElement>("[data-chapter]");
+  const chapterKey = article?.dataset.chapter;
+  if (!article || !chapterKey) return;
+
+  const subject = chapterKey.split("/")[0];
+  void import("./generated/subject-modules").then(({ subjectInitLoaders }) => {
+    const loader = subjectInitLoaders[subject];
+    if (!loader) return;
+    void loader().then((mod) => mod.initSubject(article));
+  });
+}
+
 initBookMath();
+mountSubjectInit();
 mountChapterWidgets();
 
 const catalogRoot = document.getElementById("catalog-app");