feat(seo): visual breadcrumb navigation on article + application pages

- Create Breadcrumbs.tsx server component — semantic <nav> + <ol>/<li>
  with aria-current, ChevronRight separators, Apple-clean styling
- Add breadcrumbs to news article hero overlay (reuses JSON-LD crumbs)
- Add breadcrumbs to application detail hero (passed as prop to client
  component)
- Refactor breadcrumb data into shared array for JSON-LD + visual nav

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

src/app/[locale]/applications/[slug]/ApplicationClient.tsx

@@ -9,6 +9,8 @@ import Script from "next/script";
 import { ArrowLeft, CheckCircle2, Zap, LayoutDashboard, Cpu, PencilRuler, Factory, MapPin, ChevronDown, Play, FileText, Box, Loader2, Maximize, X, ChevronLeft, ChevronRight } from "lucide-react";
 import BreathingField from "@/components/visuals/BreathingField";
 import AutoPlayVideo from "@/components/AutoPlayVideo";
+import Breadcrumbs from "@/components/seo/Breadcrumbs";
+import type { BreadcrumbItem } from "@/components/seo/Breadcrumbs";
 
 // 🔥 EL TRUCO DEFINITIVO PARA TYPESCRIPT Y WEB COMPONENTS 🔥
 // Al asignar el string a una variable con 'as any', TypeScript deja de 
@@ -999,7 +1001,7 @@ function ExpandedCaseStudy({ node }: { node: any }) {
 }
 
 // --- COMPONENTE PRINCIPAL ---
-export default function ApplicationClient({ data, realCases, images }: { data: any, realCases: any[], images: any }) {
+export default function ApplicationClient({ data, realCases, images, breadcrumbs }: { data: any, realCases: any[], images: any, breadcrumbs?: BreadcrumbItem[] }) {
   const [expandedCase, setExpandedCase] = useState<string | null>(null);
 
   const [mainLightboxOpen, setMainLightboxOpen] = useState(false);
@@ -1053,6 +1055,7 @@ export default function ApplicationClient({ data, realCases, images }: { data: a
         
         <div className="relative z-10 max-w-4xl mx-auto px-6 pb-12 md:pb-16 w-full">
           <header>
+            {breadcrumbs && <Breadcrumbs items={breadcrumbs} />}
             <div className="inline-flex items-center gap-2 text-[#0066CC] dark:text-[#00F0FF] mb-3 bg-white/80 dark:bg-black/80 backdrop-blur-sm px-3 py-1.5 rounded-full border border-black/5 dark:border-white/10">
               <LayoutDashboard size={14} />
               <span className="text-[10px] md:text-xs font-semibold uppercase tracking-widest">{data.category}</span>

src/app/[locale]/applications/[slug]/page.tsx

@@ -158,24 +158,28 @@ export default async function ApplicationPage({ params }: { params: Promise<{ sl
   const images = getApplicationImages(slug);
 
   // 4. JSON-LD structured data — wrapped to never break the render.
+  const appTitle = data?.title || "FLUX Application";
+  const appUrl = `${baseUrl()}/${locale}/applications/${slug}`;
+  const crumbs = [
+    { name: "Home", url: `/${locale}` },
+    { name: "Applications", url: `/${locale}#applications-deep` },
+    { name: appTitle, url: `/${locale}/applications/${slug}` },
+  ];
+
   let jsonLd: object[] = [];
   try {
-    const url = `${baseUrl()}/${locale}/applications/${slug}`;
-    const title = data?.title || "FLUX Application";
     const description = data?.shortDescription || data?.subtitle || "";
     jsonLd = [
       productSchema({
-        name: title,
+        name: appTitle,
         description,
         imageUrl: images.heroImage || undefined,
         category: data?.category || "RF Industrial",
-        url,
+        url: appUrl,
       }),
-      breadcrumbSchema([
+      breadcrumbSchema(
-        { name: "Home", url: `${baseUrl()}/${locale}` },
+        crumbs.map((c) => ({ name: c.name, url: `${baseUrl()}${c.url}` }))
-        { name: "Applications", url: `${baseUrl()}/${locale}#applications-deep` },
+      ),
-        { name: title, url },
-      ]),
     ];
   } catch (error) {
     console.error(`[applications/${slug}] JSON-LD build failed:`, error);
@@ -184,7 +188,7 @@ export default async function ApplicationPage({ params }: { params: Promise<{ sl
   return (
     <>
       {jsonLd.length > 0 && <JsonLd data={jsonLd} />}
-      <ApplicationClient data={data} realCases={realCases} images={images} />
+      <ApplicationClient data={data} realCases={realCases} images={images} breadcrumbs={crumbs} />
     </>
   );
 }

src/app/[locale]/news/[slug]/page.tsx

@@ -10,6 +10,7 @@ import BreathingField from "@/components/visuals/BreathingField";
 
 import { setRequestLocale } from "next-intl/server";
 import { getLocalizedData } from "@/lib/i18nHelper";
+import Breadcrumbs from "@/components/seo/Breadcrumbs";
 import {
   buildPageMetadata,
   articleSchema,
@@ -259,6 +260,12 @@ export default async function ArticlePage({ params }: { params: Promise<{ slug:
   const articleUrl = `${baseUrl()}/${locale}/news/${slug}`;
   const cover = article.coverImage ? `/news/${slug}/${article.coverImage}` : undefined;
 
+  const crumbs = [
+    { name: "Home", url: `/${locale}` },
+    { name: "News", url: `/${locale}/news` },
+    { name: article?.title || "Article", url: `/${locale}/news/${slug}` },
+  ];
+
   let jsonLd: object[] = [];
   try {
     jsonLd = [
@@ -270,11 +277,9 @@ export default async function ArticlePage({ params }: { params: Promise<{ slug:
         publishedAt: article?.publishedAt || new Date(),
         updatedAt: article?.updatedAt || new Date(),
       }),
-      breadcrumbSchema([
+      breadcrumbSchema(
-        { name: "Home", url: `${baseUrl()}/${locale}` },
+        crumbs.map((c) => ({ name: c.name, url: `${baseUrl()}${c.url}` }))
-        { name: "News", url: `${baseUrl()}/${locale}/news` },
+      ),
-        { name: article?.title || "Article", url: articleUrl },
-      ]),
     ];
   } catch (error) {
     console.error(`[news/${slug}] JSON-LD build failed:`, error);
@@ -299,6 +304,9 @@ export default async function ArticlePage({ params }: { params: Promise<{ slug:
         <div className="absolute inset-0 bg-gradient-to-t from-white via-white/80 dark:from-[#0A0A0C] dark:via-[#0A0A0C]/80 to-transparent" />
         
         <div className="relative z-10 max-w-4xl w-full mx-auto px-6 pb-12 md:pb-20 text-center">
+          <div className="flex justify-center mb-4">
+            <Breadcrumbs items={crumbs} />
+          </div>
           <div className="flex flex-wrap items-center justify-center gap-4 text-xs font-semibold uppercase tracking-widest text-[#0066CC] dark:text-[#4DA6FF] mb-6">
             <span className="flex items-center gap-1.5 bg-[#0066CC]/10 dark:bg-[#4DA6FF]/10 px-3 py-1.5 rounded-full"><Tag size={14}/> {article.category}</span>
             <time dateTime={new Date(article.publishedAt).toISOString()} className="flex items-center gap-1.5 text-[#86868B]"><Calendar size={14}/> {new Date(article.publishedAt).toLocaleDateString(locale === 'en' ? 'en-US' : locale, { month: 'long', day: 'numeric', year: 'numeric' })}</time>

src/components/seo/Breadcrumbs.tsx

@@ -0,0 +1,52 @@
+// src/components/seo/Breadcrumbs.tsx
+// ─────────────────────────────────────────────────────────────────────────────
+// Visible breadcrumb navigation trail — complements the JSON-LD BreadcrumbList
+// already rendered by individual pages.
+//
+// Design: Apple-clean, muted, small text — blends with the hero overlays
+// on article and application detail pages.
+// ─────────────────────────────────────────────────────────────────────────────
+
+import Link from "next/link";
+import { ChevronRight } from "lucide-react";
+
+export interface BreadcrumbItem {
+  name: string;
+  url: string;
+}
+
+export default function Breadcrumbs({ items }: { items: BreadcrumbItem[] }) {
+  if (items.length < 2) return null;
+
+  return (
+    <nav aria-label="Breadcrumb" className="mb-4">
+      <ol className="flex items-center gap-1 flex-wrap text-xs">
+        {items.map((item, idx) => {
+          const isLast = idx === items.length - 1;
+          return (
+            <li key={item.url} className="flex items-center gap-1">
+              {idx > 0 && (
+                <ChevronRight size={11} className="text-[#86868B]/40 shrink-0" />
+              )}
+              {isLast ? (
+                <span
+                  aria-current="page"
+                  className="text-[#1D1D1F] dark:text-white/90 font-medium truncate max-w-[220px]"
+                >
+                  {item.name}
+                </span>
+              ) : (
+                <Link
+                  href={item.url}
+                  className="text-[#86868B] hover:text-[#0066CC] dark:hover:text-[#4DA6FF] transition-colors"
+                >
+                  {item.name}
+                </Link>
+              )}
+            </li>
+          );
+        })}
+      </ol>
+    </nav>
+  );
+}