Fix: Sauberer horizontal-scroll Fix ohne destruktive CSS-Regeln

- Entfernt max-width:100vw (inkludiert Scrollbar-Breite = Bug)
- Entfernt * {max-width:100%} (bricht Flexbox/Grid Layouts)
- Stattdessen: width:100% + overflow-x:hidden auf body/#root

client/src/index.css

@@ -3,20 +3,14 @@
 @tailwind utilities;
 
 /* Prevent horizontal scroll globally */
-html, body, #root {
+html {
   overflow-x: hidden;
-  max-width: 100vw;
   overscroll-behavior-x: none;
 }
 
-/* Prevent any element from causing horizontal overflow */
-* {
-  max-width: 100%;
-}
-
-/* Exceptions for elements that legitimately need wider content */
-.overflow-x-auto, [style*="grid-template-columns"] {
-  max-width: none;
+body, #root {
+  overflow-x: hidden;
+  width: 100%;
 }
 
 /* LIGHT MODE */