Fix: Remove broken getKlausurApiUrl and clean up empty lines

sed replacement left orphaned hostname references in story page
and empty lines in getApiBase functions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

studio-v2/app/learn/[unitId]/flashcards/page.tsx

@@ -17,9 +17,6 @@ interface QAItem {
 
 function getApiBase() {
   return ''  // Same-origin proxy
-  
-  
-  
 }
 
 export default function FlashcardsPage() {

studio-v2/app/learn/[unitId]/quiz/page.tsx

@@ -15,9 +15,6 @@ interface MCQuestion {
 
 function getApiBase() {
   return ''  // Same-origin proxy
-  
-  
-  
 }
 
 export default function QuizPage() {

studio-v2/app/learn/[unitId]/story/page.tsx

@@ -7,16 +7,6 @@ import { AudioButton } from '@/components/learn/AudioButton'
 
 function getApiBase() {
   return ''  // Same-origin proxy
-  
-  
-  
-}
-
-function getKlausurApiUrl() {
-  if (typeof window === 'undefined') return 'http://localhost:8086'
-  
-  if (hostname === 'localhost') return 'http://localhost:8086'
-  return `${protocol}//${hostname}/klausur-api`
 }
 
 export default function StoryPage() {

studio-v2/app/learn/[unitId]/type/page.tsx

@@ -15,9 +15,6 @@ interface QAItem {
 
 function getApiBase() {
   return ''  // Same-origin proxy
-  
-  
-  
 }
 
 export default function TypePage() {

studio-v2/components/dashboard/LearningProgress.tsx

@@ -33,9 +33,6 @@ interface LearningProgressProps {
 
 function getApiBase() {
   return ''  // Same-origin proxy
-  
-  
-  
 }
 
 export function LearningProgress({ isDark, glassCard }: LearningProgressProps) {