feat: blog pubblico con filtri, paginazione e articolo

src/components/blog/Sidebar.astro

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+---
+import { getDb } from '../../lib/db';
+import { listRecent, listArchiveMonths } from '../../lib/posts';
+import { CATEGORIES } from '../../lib/blog-const';
+const db = getDb();
+const recent = listRecent(db, 4);
+const months = listArchiveMonths(db);
+const monthLabel = (m: string) => new Intl.DateTimeFormat('it-IT', { month: 'long', year: 'numeric' }).format(new Date(`${m}-01`));
+---
+<aside class="bside">
+  <h3>Categorie</h3>
+  {CATEGORIES.map((c) => <p><a href={`/blog?categoria=${encodeURIComponent(c)}`}>{c}</a></p>)}
+  <h3>Ultimi articoli</h3>
+  {recent.map((p) => (
+    <p><a href={`/blog/${p.slug}`}>{p.title}</a></p>
+  ))}
+  <h3>Archivio</h3>
+  {months.map((m) => <p class="bside__month">{monthLabel(m.month)} ({m.count})</p>)}
+</aside>
+
+<style>
+  .bside h3 { font-size: .85rem; text-transform: uppercase; letter-spacing: .16em; margin-top: 30px; }
+  .bside a { text-decoration: none; color: var(--c-text); }
+  .bside a:hover { color: var(--c-accent-dark); }
+  .bside__month { text-transform: capitalize; }
+</style>

src/lib/blog-const.ts

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+export const CATEGORIES = [
+  'Articoli tecnici & scientifici',
+  'Contenuti educativi',
+  'LinkedIn / Insight',
+  'Eventi & Presidi',
+] as const;

src/pages/blog/[slug].astro

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+---
+import Base from '../../layouts/Base.astro';
+import Sidebar from '../../components/blog/Sidebar.astro';
+import { getDb } from '../../lib/db';
+import { getPublishedBySlug } from '../../lib/posts';
+export const prerender = false;
+
+const post = getPublishedBySlug(getDb(), Astro.params.slug!);
+if (!post) return Astro.redirect('/404');
+const fmt = new Intl.DateTimeFormat('it-IT', { dateStyle: 'long' });
+---
+<Base title={post.title} description={post.excerpt}>
+  <section class="section">
+    <div class="container art">
+      <article>
+        {post.cover && <img class="art__cover" src={post.cover} alt="" />}
+        <p class="art__meta">{post.published_at && fmt.format(new Date(post.published_at))} · {post.category}</p>
+        <h1>{post.title}</h1>
+        <div class="art__body" set:html={post.body_html} />
+      </article>
+      <Sidebar />
+    </div>
+  </section>
+</Base>
+
+<style>
+  .art { display: grid; grid-template-columns: 2.4fr 1fr; gap: 60px; }
+  .art__cover { width: 100%; margin-bottom: 24px; }
+  .art__meta { font-size: .8rem; color: var(--c-text-light); }
+  .art__body :global(img) { margin-block: 20px; }
+  .art__body :global(blockquote) { border-left: 3px solid var(--c-accent); margin: 24px 0; padding: 6px 0 6px 20px; font-style: italic; color: var(--c-heading); }
+  @media (max-width: 991px) { .art { grid-template-columns: 1fr; } }
+</style>

src/pages/blog/index.astro

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+---
+import Base from '../../layouts/Base.astro';
+import PageHero from '../../components/PageHero.astro';
+import { getDb } from '../../lib/db';
+import { listPublished } from '../../lib/posts';
+import { CATEGORIES } from '../../lib/blog-const';
+export const prerender = false;
+
+const PER_PAGE = 9;
+const url = Astro.url;
+const category = url.searchParams.get('categoria') ?? undefined;
+const page = Math.max(1, Number(url.searchParams.get('pagina') ?? '1') || 1);
+const { items, total } = listPublished(getDb(), {
+  category: category && (CATEGORIES as readonly string[]).includes(category) ? category : undefined,
+  page, perPage: PER_PAGE,
+});
+const pages = Math.max(1, Math.ceil(total / PER_PAGE));
+const fmt = (d: string | null) => d ? new Intl.DateTimeFormat('it-IT', { dateStyle: 'long' }).format(new Date(d)) : '';
+const linkFor = (cat?: string, p = 1) => {
+  const q = new URLSearchParams();
+  if (cat) q.set('categoria', cat);
+  if (p > 1) q.set('pagina', String(p));
+  const s = q.toString();
+  return `/blog${s ? `?${s}` : ''}`;
+};
+---
+<Base title="Blog & Edugo" description="Edugo è lo spazio di InsanityLab dedicato alla conoscenza: articoli, guide e approfondimenti su allenamento, nutrizione e salute.">
+  <PageHero title="Blog & Edugo" />
+  <section class="section">
+    <div class="container">
+      <div class="section-heading">
+        <h2>Blog & Edugo</h2>
+        <p>Edugo è lo spazio di InsanityLab dedicato alla conoscenza: articoli, guide e approfondimenti su allenamento, nutrizione e salute per capire il corpo e migliorare il proprio benessere. Perché la conoscenza è il primo passo del cambiamento.</p>
+      </div>
+      <nav class="bfilters" aria-label="categorie">
+        <a class:list={['bfilters__item', { 'is-active': !category }]} href={linkFor()}>Mostra tutto</a>
+        {CATEGORIES.map((c) => (
+          <a class:list={['bfilters__item', { 'is-active': category === c }]} href={linkFor(c)}>{c}</a>
+        ))}
+      </nav>
+      {items.length === 0 ? (
+        <p style="text-align:center">Nessun articolo pubblicato{category ? ' in questa categoria' : ''}, torna a trovarci presto.</p>
+      ) : (
+        <div class="bgrid">
+          {items.map((post) => (
+            <article class="bcard">
+              {post.cover && <a href={`/blog/${post.slug}`}><img src={post.cover} alt="" loading="lazy" /></a>}
+              <p class="bcard__date">{fmt(post.published_at)}</p>
+              <h3><a href={`/blog/${post.slug}`}>{post.title}</a></h3>
+              <p>{post.excerpt}</p>
+              <a class="bcard__more" href={`/blog/${post.slug}`}>Per saperne di più →</a>
+            </article>
+          ))}
+        </div>
+      )}
+      {pages > 1 && (
+        <nav class="bpages" aria-label="paginazione">
+          {Array.from({ length: pages }, (_, i) => (
+            <a class:list={['bpages__n', { 'is-active': page === i + 1 }]} href={linkFor(category, i + 1)}>{i + 1}</a>
+          ))}
+        </nav>
+      )}
+    </div>
+  </section>
+</Base>
+
+<style>
+  .bfilters { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 50px; }
+  .bfilters__item { font-family: var(--font-heading); font-size: .7rem; letter-spacing: .16em; text-transform: uppercase; text-decoration: none; color: var(--c-text); padding: 10px 16px; }
+  .bfilters__item.is-active { background: var(--c-accent); color: #fff; }
+  .bgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 50px 40px; }
+  .bcard img { aspect-ratio: 4/3; object-fit: cover; width: 100%; margin-bottom: 14px; }
+  .bcard__date { font-size: .78rem; color: var(--c-text-light); margin-bottom: 4px; }
+  .bcard h3 a { text-decoration: none; }
+  .bcard__more { font-family: var(--font-heading); font-size: .7rem; font-weight: 600; letter-spacing: .18em; text-transform: uppercase; text-decoration: none; color: var(--c-heading); }
+  .bpages { display: flex; gap: 8px; justify-content: center; margin-top: 50px; }
+  .bpages__n { font-family: var(--font-heading); text-decoration: none; padding: 8px 14px; color: var(--c-text); }
+  .bpages__n.is-active { background: var(--c-dark); color: #fff; }
+  @media (max-width: 991px) { .bgrid { grid-template-columns: 1fr 1fr; } }
+  @media (max-width: 600px) { .bgrid { grid-template-columns: 1fr; } }
+</style>