feat(swift): Epic 4 - Navigation & Auth compleet

E4.S1 - Login form uitbreiden:
- Interface selector (Swift/Klassiek) toegevoegd
- Visuele keuze met icons (Layout/Zap)
- Redirect naar gekozen interface na login

E4.S2 - Preference opslag:
- updateInterfacePreference() in lib/auth/client.ts
- getInterfacePreference() voor ophalen
- Opslag in user_metadata.preferred_interface

E4.S3 - Redirect middleware:
- /epd → redirect naar preferred interface
- /login → redirect naar preferred interface (als ingelogd)
- Default: klassiek (/epd/clients)

E4.S4 - Fallback Picker:
- FallbackPicker component voor lage confidence
- Grid met 3 opties (Notitie, Zoeken, Overdracht)
- Keyboard shortcuts [1], [2], [3]
- Toont originele input voor context

Voortgang: Epic 4 compleet (8 SP)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

middleware.ts

@@ -85,9 +85,20 @@ export async function middleware(request: NextRequest) {
     return NextResponse.redirect(redirectUrl)
   }
 
-  // Redirect to /epd/patients if authenticated and trying to access login
+  // Helper: get preferred interface redirect path
+  const getPreferredPath = () => {
+    const preference = user?.user_metadata?.preferred_interface
+    return preference === 'swift' ? '/epd/swift' : '/epd/clients'
+  }
+
+  // Redirect to preferred interface if authenticated and trying to access login
   if (user && pathname === '/login') {
-    return NextResponse.redirect(new URL('/epd/patients', request.url))
+    return NextResponse.redirect(new URL(getPreferredPath(), request.url))
+  }
+
+  // Redirect /epd to preferred interface based on user preference
+  if (user && pathname === '/epd') {
+    return NextResponse.redirect(new URL(getPreferredPath(), request.url))
   }
 
   return supabaseResponse