Add the trailing period to "einfach produktiv." wherever it was missing

The period is part of the brand name (see Footer.tsx's own comment on
the two-tone logo treatment) — fixed every place it was cleanly
appendable (string/heading endings, or before a dash, matching the
existing precedent in VertragspartnerBlock.tsx). Left the handful of
genuinely awkward mid-sentence spots alone (separable-verb endings,
"einfach produktiv-Konto" hyphenated compounds) rather than force a
period that breaks the sentence — flagging those separately.

Also: Über-mich's checklist now uses the same brand checkmark as
/lebensuhr and /7-tage-klarheits-check instead of plain bullets.

app/tasse-die-pause/page.tsx

@@ -10,7 +10,7 @@ import { buildProductSchema } from "../lib/structuredData";
 // tagline, unlike every other bespoke page here — see Hero.tsx's comment.
 export async function generateMetadata(): Promise<Metadata> {
   const product = await getProductBySlug("tasse-die-pause");
-  const title = product ? `${product.name} – einfach produktiv` : "Tasse – einfach produktiv";
+  const title = product ? `${product.name} – einfach produktiv.` : "Tasse – einfach produktiv.";
   const description = product?.description ?? undefined;
   return {
     title,