fix(home): equal-height service tiles + dedupe services

Service section on home page had two issues:
1. Tiles were different heights (longer content = taller tile)
   because .bento-tile had no min-height
2. Two service tiles showed the same title (AI Consult + Automation
   Consult) because src/content/services/ has 4 old + 4 -new mdx
   files; .slice(0, 4) grabbed the first 4 alphabetically which
   contained duplicate base slugs

Fixes:
- Add min-height: 380px + flex column to BentoTile so all tiles
  in a row are visually equal regardless of content length
- Add dedupedServices helper in index.astro that groups services
  by base slug and prefers the -new version when both exist
- Use dedupedServices.slice(0, 4) instead of services.slice(0, 4)

Result: 4 unique services (ai-consult-new, automation-new,
marketing-new, webdev-new) at equal height, filling the row.

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

src/components/BentoTile.astro

@@ -67,6 +67,9 @@ const revealClass = reveal ? 'reveal' : '';
     overflow: hidden;
     transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s ease;
     transform-style: preserve-3d;
+    min-height: 380px;
+    display: flex;
+    flex-direction: column;
   }
   .bento-tile:hover {
     transform: translateY(-4px);