Build the full site from the copy decks

Adds About, Contact, Services (index + 8) and Industries (index + 7),
generated from structured JSON converted out of the .docx copy decks
by scripts/convert-docs.py. Shared header with dropdowns, footer,
contact form (mailto until a backend exists), FAQ/breadcrumb JSON-LD,
sitemap and robots.

src/components/reveal-observer.tsx

@@ -2,23 +2,48 @@
 
 import { useEffect } from "react";
 
-/** Adds `is-in` to every `[data-reveal]` / `[data-reveal-group]` element as it scrolls into view. */
+const SELECTOR = "[data-reveal], [data-reveal-group]";
+
+/**
+ * Marks `[data-reveal]` / `[data-reveal-group]` elements with `data-in` as they scroll into view.
+ * Render it as the last child of a page: its effect then runs only after the page's markup has
+ * hydrated, so touching those elements can't cause a hydration mismatch.
+ */
 export default function RevealObserver() {
   useEffect(() => {
-    const targets = document.querySelectorAll<HTMLElement>("[data-reveal], [data-reveal-group]");
     const io = new IntersectionObserver(
       (entries) => {
         for (const entry of entries) {
           if (entry.isIntersecting) {
-            entry.target.classList.add("is-in");
+            (entry.target as HTMLElement).dataset.in = "";
             io.unobserve(entry.target);
           }
         }
       },
       { rootMargin: "0px 0px -12% 0px", threshold: 0.12 },
     );
-    targets.forEach((el) => io.observe(el));
-    return () => io.disconnect();
+    const watch = (root: ParentNode) =>
+      root.querySelectorAll<HTMLElement>(SELECTOR).forEach((el) => {
+        if (!("in" in el.dataset)) io.observe(el);
+      });
+
+    watch(document);
+    const mo = new MutationObserver((records) => {
+      for (const r of records) {
+        r.addedNodes.forEach((n) => {
+          if (n instanceof HTMLElement) {
+            if (n.matches(SELECTOR) && !("in" in n.dataset)) io.observe(n);
+            watch(n);
+          }
+        });
+      }
+    });
+    mo.observe(document.body, { childList: true, subtree: true });
+
+    return () => {
+      io.disconnect();
+      mo.disconnect();
+    };
   }, []);
 
   return null;