feat(home): hero availability status and CTAs

The homepage hero had no call to action (Phase 0 finding). Add a live
availability pill and primary/secondary CTAs while keeping the signature title.

- HomeHero: optional availability status pill (pulsing dot) plus primary
  (view work) and secondary (contact) CTAs, RTL-aware arrow, using the type
  scale. Backward compatible (all new props optional).
- Wire copy + hrefs from the homepage; add heroVisual.primaryCta /
  secondaryCta to en/de/ar.

Verified: JSON valid, eslint clean, no new type errors.

messages/de.json

@@ -44,6 +44,8 @@
     },
     "heroVisual": {
       "kicker": "Hi, ich bin Moh",
+      "primaryCta": "Arbeiten ansehen",
+      "secondaryCta": "Kontakt aufnehmen",
       "title": "frontend\ndeveloper\n& designer",
       "description": "Ich entwickle digitale Loesungen fuer echte Probleme,\ndie gut aussehen und sauber funktionieren."
     },