manufacturers + NAB Show naming sweep

- Standardize "NAB Show" / "2026 NAB Show" across badges, filter chips,
  and headings; never bare "NAB" in user-facing copy.
- /manufacturers/[slug]: normalize show name at render, strip
  randomstring suffix on booth, hide booth unless the show is within 90
  days, filter single-letter junk out of category display.
- News filter "NAB Show" chip loose-matches any nab-tagged article so
  legacy "NAB 2026" tags still surface.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/ads.ts

@@ -57,7 +57,7 @@ const FALLBACK: Ad[] = [
     alt: "Zixi", click_url: "https://zixi.com/" },
   { slug: "telycam-300x250", label: "Telycam MixOne / ExploreXE", size: "300x250",
     src: "/legacy/ads/Telycam_Broadcast Beat_300x250_MixOne-ExploreXE_with_NAB2026_2f30157f.gif",
-    alt: "Telycam MixOne / ExploreXE — NAB 2026", click_url: "https://telycam.com/" },
+    alt: "Telycam MixOne / ExploreXE — 2026 NAB Show", click_url: "https://telycam.com/" },
   { slug: "lectrosonics-300x250", label: "Lectrosonics", size: "300x250",
     src: "/legacy/ads/300x250-banner-Our-Story-film_resize.jpg",
     alt: "Lectrosonics Our Story", click_url: "https://www.lectrosonics.com/" },