feat(mobile): add scroll-touch momentum utility for horizontal strips

Add a `.scroll-touch` utility that restores iOS WebKit momentum
scrolling (`-webkit-overflow-scrolling: touch`) and contains the
overscroll chain so a flick at the end of a horizontal row does not
rubber-band the whole page. Apply it to the insights tab strip and the
cycle tab list — the two in-app horizontal scrollers that lost inertial
flick under the default `overflow-x-auto`.

src/components/cycle/cycle-view.tsx

@@ -255,7 +255,7 @@ export function CycleView() {
               triggers size to their content (`text-xs`, no `flex-1`) and the
               strip scrolls cleanly if needed; from `sm` up they reclaim the
               equal-width `flex-1` layout. */}
-          <TabsList className="w-full max-w-full overflow-x-auto">
+          <TabsList className="scroll-touch w-full max-w-full overflow-x-auto">
             <TabsTrigger
               value="calendar"
               className="text-xs sm:flex-1 sm:text-sm"