Fix scroll broken on mobile - remove overscroll-behavior:none and webkit-overflow-scrolling:touch from globals

Both were added in the last mobile optimization and caused touch scroll
to stop working on Android/GrapheneOS browsers:
- overscroll-behavior: none on html/body blocks native touch scroll
- * { -webkit-overflow-scrolling: touch } on every element interferes
  with the browser's native scroll handling

Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>

src/index.css

@@ -347,13 +347,8 @@
 html, body {
   overflow-x: hidden;
   max-width: 100vw;
-  /* Prevent elastic overscroll on the root — pages handle their own scroll */
-  overscroll-behavior: none;
-}
-
-/* Smooth momentum scrolling on iOS */
-* {
-  -webkit-overflow-scrolling: touch;
+  /* Allow normal vertical scrolling — do NOT set overscroll-behavior: none here
+     as it blocks touch scroll on Android browsers */
 }
 
 /* Better tap highlight on mobile — subtle red glow */