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>

components/swift/command-center/command-input.tsx

@@ -152,29 +152,16 @@ export const CommandInput = forwardRef<HTMLInputElement>(function CommandInput(_
         
         clearInput();
       } else {
-        // Low confidence or unknown intent - temporary fallback to dagnotitie
-        // TODO: Replace with FallbackPicker in E4.S4
-        openBlock('dagnotitie', { content: inputText });
-        
-        addRecentAction({
-          intent: 'dagnotitie',
-          label: inputText.slice(0, 50),
-        });
-        
+        // Low confidence or unknown intent - show FallbackPicker
+        openBlock('fallback', { content: inputText });
         clearInput();
       }
     } catch (error) {
       console.error('Error processing intent:', error);
-      
-      // On error, fallback to dagnotitie with the input as content
+
+      // On error, show FallbackPicker so user can choose
       // This ensures the user's input is not lost
-      openBlock('dagnotitie', { content: inputText });
-      
-      addRecentAction({
-        intent: 'dagnotitie',
-        label: inputText.slice(0, 50),
-      });
-      
+      openBlock('fallback', { content: inputText });
       clearInput();
     } finally {
       setIsProcessing(false);