Update .gitignore to include additional static assets for KaTeX, add KaTeX and Commander dependencies in package.json and bun.lock, enhance footer with an About link in base.html, and improve work card links in index.html. Update Vite configuration for asset handling and add new components in SASS files.

data/manifest.json

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+{
+  "intro": "Our guiding principles are set in stone.",
+  "lead": "Open Free Books is free internet textbooks for learners from elementary school through university — static, open source, and built for the web. These are the values we will not trade away as the catalog grows.",
+  "principles": [
+    {
+      "id": "free",
+      "title": "Free",
+      "body": "Every book, every chapter, every learner — no paywalls, no premium unlocks, no subscription that gates the syllabus. Free is not a trial; it is the product, forever."
+    },
+    {
+      "id": "open",
+      "title": "Open",
+      "body": "Source on GitHub, improvements via pull requests, forks for classrooms and regions. Open means you can see how the book was made, fix a typo today, and ship a better edition tomorrow — not a PDF locked behind a login."
+    },
+    {
+      "id": "curriculum",
+      "title": "Curriculum",
+      "body": "Not a wiki. Wikis excel at scattered facts; they do not carry a learner from prerequisite to mastery. We publish opinionated paths: ordered chapters, assessed skills, and a point of view about what to teach next — structure on purpose, not everything about X."
+    },
+    {
+      "id": "independent",
+      "title": "Independent",
+      "body": "Built for learners and teachers, not for ad networks or investor growth charts. Sustainability comes from community contribution and shared infrastructure, not from turning students into the product."
+    },
+    {
+      "id": "durable",
+      "title": "Durable",
+      "body": "Static HTML in an open repository — readable in a browser today, archivable tomorrow, forkable for decades. Your syllabus should not vanish when a vendor sunsets digital textbooks or changes the terms."
+    },
+    {
+      "id": "crafted",
+      "title": "Crafted",
+      "body": "Books are authored HTML with care: figures, interactives, and JSON Canvas where they help understanding — not generated slop or print PDFs pasted on the web. Quality is a deliberate choice on every page."
+    },
+    {
+      "id": "inspectable",
+      "title": "Inspectable",
+      "body": "Every change has a commit. Teachers can adapt a fork for their syllabus with diffs and review, not opaque exports from a CMS. If something is wrong, you can find who wrote it and fix it."
+    },
+    {
+      "id": "web-native",
+      "title": "Web-native",
+      "body": "The medium is the open web: links, search, accessibility, and embeddable demos — not a file you download once and never update. Textbooks should behave like the rest of the internet learners already use."
+    }
+  ]
+}

data/math-dse-curriculum.json

@@ -0,0 +1,85 @@
+{
+  "title": "Hong Kong Mathematics",
+  "subtitle": "DSE Compulsory Part (S4–S6)",
+  "intro": "Structured around the three core strands of the Hong Kong mathematics curriculum. Chapters marked as available can be read now; others are on the roadmap.",
+  "strands": [
+    {
+      "id": "number-algebra",
+      "title": "Number & Algebra",
+      "chapters": [
+        {
+          "slug": "quadratic-equations",
+          "title": "Quadratic equations",
+          "status": "live"
+        },
+        {
+          "slug": "sequences",
+          "title": "Sequences & series",
+          "status": "planned"
+        },
+        {
+          "slug": "functions-graphs",
+          "title": "Functions & graphs",
+          "status": "planned"
+        },
+        {
+          "slug": "linear-programming",
+          "title": "Linear programming",
+          "status": "planned"
+        }
+      ]
+    },
+    {
+      "id": "measures-shape-space",
+      "title": "Measures, Shape & Space",
+      "chapters": [
+        {
+          "slug": "trigonometry",
+          "title": "Advanced trigonometry",
+          "status": "planned"
+        },
+        {
+          "slug": "coordinate-geometry",
+          "title": "Coordinate geometry of circles",
+          "status": "planned"
+        },
+        {
+          "slug": "circle-properties",
+          "title": "Properties of circles",
+          "status": "planned"
+        },
+        {
+          "slug": "loci",
+          "title": "Loci",
+          "status": "planned"
+        }
+      ]
+    },
+    {
+      "id": "data-handling",
+      "title": "Data Handling",
+      "chapters": [
+        {
+          "slug": "dispersion",
+          "title": "Measures of dispersion",
+          "status": "planned"
+        },
+        {
+          "slug": "probability",
+          "title": "Permutations, combinations & probability",
+          "status": "planned"
+        },
+        {
+          "slug": "normal-distribution",
+          "title": "Normal distribution & z-scores",
+          "status": "planned"
+        },
+        {
+          "slug": "statistical-literacy",
+          "title": "Statistical literacy",
+          "status": "planned"
+        }
+      ]
+    }
+  ]
+}