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/components/CompaniesInThisStory.tsx

@@ -95,12 +95,12 @@ export default async function CompaniesInThisStory({ slugs }: { slugs: string[]
                   )}
                   {t.exhibitsNab && (
                     <span className="bg-amber-500/15 text-amber-300 px-1.5 py-0.5 rounded">
-                      NAB 26
+                      2026 NAB Show
                     </span>
                   )}
                   {t.exhibitsIbc && (
                     <span className="bg-blue-500/15 text-blue-300 px-1.5 py-0.5 rounded">
-                      IBC
+                      IBC 2026
                     </span>
                   )}
                 </div>