cross-link: forum auto-link, NAB hub, sponsor strip, recent stories

Feature 3 — forum auto-linking
  Thread + reply bodies in /forum/thread/[id] now wrap company-name
  mentions with /manufacturers/<slug> links via a new client-side
  LinkifyPlainText component. Loads the directory list once per page
  (module-level promise cache), regex-scans each body, preserves
  whitespace, caps at 10 links per body to avoid clutter.
  CompanyMentionsHover mounted on the page so the same preview card
  pops on hover.
  Adds /api/public/companies/list — minimal { name, slug } directory
  feed, cached 10min.

Feature 4 — /nab-2026 live coverage hub
  New page aggregating every directory company with exhibits_nab=true.
  Three sections:
    - Coverage Partners — active advertisers exhibiting at NAB, larger
      tiles with emerald Sponsor border
    - Latest from the show floor — last 60 days of articles with NAB
      in the title, cinematic grid
    - All NAB 2026 exhibitors — alphabetical, capped at 200 with link
      to full /manufacturers directory
  Every company tile carries data-company-slug for hover previews.

Feature 5b — Sponsor logo strip on homepage
  New SponsorLogoStrip server component renders just above the footer
  on the homepage, showing logos of every current banner advertiser
  with a directory entry + logo. Each links to the manufacturer
  profile with the hover-card slug attribute.

Feature 5c — Recent coverage on manufacturer profiles
  /manufacturers/[slug] now includes a grid of the 6 most recent
  articles matching the company name in the title, with thumbnails.
  Renames the existing manufacturer_id-linked block to "Press
  releases" since it's a separate data source.

src/app/api/public/companies/list/route.ts

@@ -0,0 +1,29 @@
+import { NextResponse } from "next/server";
+import { createAdminClient } from "@/lib/supabase/admin";
+
+// Cache aggressively — directory rarely changes, and 1k+ companies is ~50KB.
+export const revalidate = 600;
+
+export async function GET() {
+  try {
+    const svc = createAdminClient();
+    const { data } = await svc
+      .from("tracked_companies")
+      .select("company_name, slug")
+      .eq("directory_visible", true)
+      .not("slug", "is", null)
+      .not("company_name", "is", null);
+
+    const rows = (data || [])
+      .filter((r: any) => r.company_name && r.slug)
+      .map((r: any) => ({ name: String(r.company_name).trim(), slug: String(r.slug) }))
+      .filter((r) => r.name.length >= 3);
+
+    return NextResponse.json(
+      { companies: rows },
+      { headers: { "Cache-Control": "public, s-maxage=600, stale-while-revalidate=1200" } },
+    );
+  } catch (e: any) {
+    return NextResponse.json({ companies: [], error: e?.message || "error" }, { status: 500 });
+  }
+}