Browse: scroll the root shelves again, just without a scrollbar

Hiding the vertical scrollbar with overflow: hidden also stopped the wheel from
scrolling. Keep overflow: auto and hide only the bar, as the shelf rows already do.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/components/BrowseView.tsx

@@ -190,14 +190,13 @@ function BrowseViewImpl({
         />
         <div
           ref={scroller}
-          className={ANIMATE_VIEW_TRANSITIONS ? "view-enter" : undefined}
+          className={`no-scrollbar${ANIMATE_VIEW_TRANSITIONS ? " view-enter" : ""}`}
           // Right padding reserves room for the tab rail's own glass bar (see
           // TAB_RAIL_CLEARANCE) so a full-width shelf row never renders under it. The
-          // three rows fit the screen, so no vertical scrollbar: each row scrolls
+          // vertical scrollbar is hidden, but the wheel and touch still scroll.
-          // sideways on its own.
           style={{
             flex: 1,
-            overflow: "hidden",
+            overflow: "auto",
             minHeight: 0,
             padding: `14px ${TAB_RAIL_CLEARANCE}px 250px 32px`,
           }}

web/src/styles/app.css

@@ -273,11 +273,17 @@ button {
      focused. */
   padding: 14px 10px 14px;
   cursor: grab;
+}
+
+/* Scrolls by wheel, touch and keyboard, but draws no scrollbar. */
+.shelf-row,
+.no-scrollbar {
   scrollbar-width: none; /* Firefox */
   -ms-overflow-style: none; /* old Edge */
 }
 
-.shelf-row::-webkit-scrollbar {
+.shelf-row::-webkit-scrollbar,
+.no-scrollbar::-webkit-scrollbar {
   display: none; /* Chrome, Safari */
 }