delete sampleArticles seed; serve all sections from bb.wp_imported_posts (DB)

Eliminates 72 hardcoded rocket.new image refs in one shot. Section pages
(/gear, /technology, /show-coverage, /news) now render from
bb.wp_imported_posts via getLegacyArticlesBySection(section), which maps
each non-news section to a curated tag set (e.g. gear -> Audio, Cameras,
lighting, Blackmagic Design, monitoring; technology -> AI, Streaming,
OTT, IP, Cloud, AV; show-coverage -> NAB, IBC, BroadcastAsia).

Also:
- src/lib/articles/types.ts: Article interface lifted out of the deleted
  seed file. Type-only consumers (NewsArticleDetailClient,
  ArticleDetailClient, legacy-source) re-imported from here.
- /news (client component) now wrapped: server fetches articles from DB
  and passes to NewsPageClient. Filter UI unchanged.
- generateStaticParams on /news/[slug] and /articles/[slug] no longer
  references seed slugs; pre-renders 50 most-recent imported slugs and
  relies on dynamicParams + revalidate=3600 for the rest.
- sitemap.ts now sources article URLs from
  getLegacyRecentSitemapEntries() (up to 5000 most-recent imported posts).
  Default BASE_URL fallback updated from the rocket.new placeholder to
  bb-staging.onsethost.com.
- src/app/api/ai/article-suggestions/route.ts now pulls candidates from
  the DB (top 100 recent news) and resolves AI-returned slugs via DB
  lookup if not in the candidate window.

Inline rocket.new image refs in homepage components (ArticleFeed,
FeaturedBento) are unchanged in this commit; those are inline seed
arrays in the components, not imports of sampleArticles.

src/lib/articles/legacy-source.ts

@@ -1,5 +1,5 @@
 import { createClient } from "@supabase/supabase-js";
-import type { Article } from "./sampleArticles";
+import type { Article } from "./types";
 import { rewriteLegacyImageUrl, rewriteLegacyImageUrlsInHtml } from "@/lib/legacy-image";
 
 const SUPABASE_URL = process.env.NEXT_PUBLIC_SUPABASE_URL!;
@@ -30,24 +30,46 @@ interface ImportedPostRow {
 
 const FALLBACK_IMAGE = "/legacy/site/no_image.png";
 
+// Tag → section mapping. Source: tag distribution observed in
+// bb.wp_imported_posts. Matches against any overlap (lowercased).
+type Section = Article["section"];
+const SECTION_TAGS: Record<Section, string[]> = {
+  gear: [
+    "Audio", "Cameras", "lighting", "Lighting", "Reviews",
+    "Blackmagic Design", "blackmagic", "Sony", "Canon", "ARRI", "RED",
+    "monitoring", "Test and Measurement",
+  ],
+  technology: [
+    "AI", "Streaming", "OTT", "ip", "IP", "Cloud",
+    "AV", "audio-over-IP interfaces",
+    "IP Workflows", "Live Production", "Cloud Production",
+    "MAM", "Storage", "Encoding",
+  ],
+  "show-coverage": [
+    "NAB", "NAB Show", "NAB 2025", "NAB 2026",
+    "IBC", "IBC 2025", "IBC 2026",
+    "BroadcastAsia", "BroadcastAsia 2026", "Broadcast Asia 2026",
+    "InfoComm", "MPTS",
+  ],
+  news: [], // catch-all — no tag filter
+};
+
 function authorSlug(name: string | null): string {
   if (!name) return "staff-reporter";
-  return name
-    .toLowerCase()
-    .replace(/[^a-z0-9]+/g, "-")
-    .replace(/^-+|-+$/g, "")
-    .slice(0, 60) || "staff-reporter";
+  return (
+    name
+      .toLowerCase()
+      .replace(/[^a-z0-9]+/g, "-")
+      .replace(/^-+|-+$/g, "")
+      .slice(0, 60) || "staff-reporter"
+  );
 }
 
 function formatDate(iso: string | null): string {
   if (!iso) return "";
   const d = new Date(iso);
   if (isNaN(d.getTime())) return "";
-  return d.toLocaleDateString("en-US", {
-    month: "long",
-    day: "numeric",
-    year: "numeric",
-  });
+  return d.toLocaleDateString("en-US", { month: "long", day: "numeric", year: "numeric" });
 }
 
 function readTime(content: string | null): string {
@@ -58,7 +80,7 @@ function readTime(content: string | null): string {
   return `${minutes} min read`;
 }
 
-function rowToArticle(row: ImportedPostRow): Article {
+function rowToArticle(row: ImportedPostRow, section: Section = "news"): Article {
   const image = row.featured_image
     ? rewriteLegacyImageUrl(row.featured_image)
     : FALLBACK_IMAGE;
@@ -66,7 +88,7 @@ function rowToArticle(row: ImportedPostRow): Article {
   const author = row.author_name || "Staff Reporter";
   return {
     slug: row.wp_slug,
-    section: "news",
+    section,
     title: row.title,
     excerpt: row.excerpt || "",
     category: (row.category || "NEWS").toUpperCase(),
@@ -83,13 +105,14 @@ function rowToArticle(row: ImportedPostRow): Article {
   };
 }
 
+const SELECT_COLS =
+  "wp_id,wp_slug,title,excerpt,content,author_name,category,tags,featured_image,featured_image_alt,status,wp_published_at";
+
 export async function getLegacyArticleBySlug(slug: string): Promise<Article | null> {
   try {
     const { data, error } = await client()
       .from("wp_imported_posts")
-      .select(
-        "wp_id,wp_slug,title,excerpt,content,author_name,category,tags,featured_image,featured_image_alt,status,wp_published_at",
-      )
+      .select(SELECT_COLS)
       .eq("wp_slug", slug)
       .eq("status", "published")
       .maybeSingle();
@@ -108,9 +131,7 @@ export async function getLegacyRelatedArticles(
   try {
     let q = client()
       .from("wp_imported_posts")
-      .select(
-        "wp_id,wp_slug,title,excerpt,content,author_name,category,tags,featured_image,featured_image_alt,status,wp_published_at",
-      )
+      .select(SELECT_COLS)
       .eq("status", "published")
       .neq("wp_slug", excludeSlug)
       .order("wp_published_at", { ascending: false })
@@ -118,7 +139,32 @@ export async function getLegacyRelatedArticles(
     if (category) q = q.eq("category", category);
     const { data, error } = await q;
     if (error || !data) return [];
-    return (data as ImportedPostRow[]).map(rowToArticle);
+    return (data as ImportedPostRow[]).map((r) => rowToArticle(r));
+  } catch {
+    return [];
+  }
+}
+
+/** Section-filtered listing. `news` returns all; gear/technology/show-coverage
+ *  filter by tag overlap against SECTION_TAGS. */
+export async function getLegacyArticlesBySection(
+  section: Section,
+  limit = 200,
+): Promise<Article[]> {
+  try {
+    let q = client()
+      .from("wp_imported_posts")
+      .select(SELECT_COLS)
+      .eq("status", "published")
+      .order("wp_published_at", { ascending: false })
+      .limit(limit);
+    const tags = SECTION_TAGS[section];
+    if (tags.length > 0) {
+      q = q.overlaps("tags", tags);
+    }
+    const { data, error } = await q;
+    if (error || !data) return [];
+    return (data as ImportedPostRow[]).map((r) => rowToArticle(r, section));
   } catch {
     return [];
   }
@@ -137,3 +183,22 @@ export async function getLegacyRecentSlugs(limit = 200): Promise<string[]> {
     return [];
   }
 }
+
+export async function getLegacyRecentSitemapEntries(
+  limit = 5000,
+): Promise<{ slug: string; date: string }[]> {
+  try {
+    const { data } = await client()
+      .from("wp_imported_posts")
+      .select("wp_slug,wp_published_at")
+      .eq("status", "published")
+      .order("wp_published_at", { ascending: false })
+      .limit(limit);
+    return (data || []).map((r: { wp_slug: string; wp_published_at: string | null }) => ({
+      slug: r.wp_slug,
+      date: r.wp_published_at || new Date().toISOString(),
+    }));
+  } catch {
+    return [];
+  }
+}