build website improvements

src-build/docs-website/main.js

@@ -0,0 +1,30 @@
+document.addEventListener('DOMContentLoaded', function () {
+    for (const li of document.querySelectorAll('.note-tree-nav li')) {
+        const branchId = li.getAttribute("data-branch-id");
+        if (branchId.startsWith("root_")) {
+            // first level is expanded and cannot be collapsed
+            continue;
+        }
+
+        const newDiv = document.createElement("span");
+        const subList = li.querySelector('ul');
+
+        if (subList) {
+            const toggleVisibility = (show) => {
+                newDiv.innerHTML = show ? "▾ " : "▸ ";
+                subList.style.display = show ? 'block' : 'none';
+
+                localStorage.setItem(branchId, show ? "true" : "false");
+            };
+
+            newDiv.classList.add("expander");
+            newDiv.addEventListener('click', () => toggleVisibility(subList.style.display === 'none'));
+
+            toggleVisibility(localStorage.getItem(branchId) === "true");
+        } else {
+            newDiv.classList.add("spacer");
+        }
+
+        li.prepend(newDiv);
+    }
+}, false);