Simplify hero backgrounds and add entrance animations

- Replace animated blob/wave/noise backdrop with clean static gradient
  (radial ellipse highlights + linear fade) in hero-motion-backdrop
- Remove all framer-motion from background layer; delete unused CSS
  classes: hero-blob, hero-sheet-glow, hero-sheet-wave, hero-sheet-noise,
  hero-title-shift keyframe, and responsive blob media queries
- Add framer-motion stagger entrance to HeroContentMotion, HeroMotionItem,
  and HeroTitle (slide-up + fade on mount)
- Refactor coming-soon page to use HeroContentMotion/HeroMotionItem
  instead of MotionFade (whileInView unreliable above the fold)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/_admin/portfolio/actions.ts

@@ -582,7 +582,7 @@ export async function deleteProjectAction(formData: FormData) {
     });
 
     if (!project) {
-      redirect(withMessage(getAdminAppPath("/portfolio"), "error", "Project not found."));
+      redirect(withMessage(getAdminAppPath("/portfolio"), "error", "Projekt nicht gefunden."));
     }
 
     await prisma.portfolioProject.delete({