ui: drop '12,847 indexed' badge in Ask BB AI; remove rocket.new logo from footer

Two unrelated tidy-ups, bundled:

- src/components/AskBBAI.tsx: remove the "12,847 indexed" subtitle next
  to the Ask BB AI floating-action button (placeholder/mock text from
  the original mockup; the real index count isn't wired in).

- src/components/Footer.tsx: the footer-bottom logo was sourcing an
  image from img.rocket.new — a third-party CDN unrelated to BB
  (artifact from the initial rocket.new export). Replace with a plain
  text wordmark Link to /home-page. No third-party image, same UX.

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

src/components/AskBBAI.tsx

@@ -75,7 +75,6 @@ export default function AskBBAI() {
             <span className="bb-ring" />
           </span>
           <span className="font-serif">Ask BB AI</span>
-          <span className="font-mono text-[10px] text-zinc-400 hidden md:inline">12,847 indexed</span>
         </button>
       )}