feat(site): rewrite public copy around the batch chain

Replace slogan-heavy bilingual copy with concrete industrial prose on home, about, work, notes, and contact, without invented metrics or em dashes.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/contact/mail.ts

@@ -35,8 +35,8 @@ async function smtpSend(config: SmtpConfig, inquiry: Inquiry): Promise<void> {
   const body = [
     `Name: ${inquiry.name}`,
     `E-Mail: ${inquiry.email}`,
-    `Unternehmen: ${inquiry.company || "—"}`,
-    `Thema: ${inquiry.topic || "—"}`,
+    `Unternehmen: ${inquiry.company || "-"}`,
+    `Thema: ${inquiry.topic || "-"}`,
     `Sprache: ${inquiry.locale}`,
     "",
     inquiry.message,