fix(web): stick action bar on search (#5459)

web/src/routes/(user)/search/+page.svelte

@@ -106,6 +106,7 @@
 
 <section>
   {#if isMultiSelectionMode}
+    <div class="fixed z-[100] top-0 left-0 w-full">
       <AssetSelectControlBar assets={selectedAssets} clearSelect={() => (selectedAssets = new Set())}>
         <CreateSharedLink />
         <CircleIconButton title="Select all" icon={mdiSelectAll} on:click={handleSelectAll} />
@@ -123,6 +124,7 @@
           <ChangeLocation menuItem />
         </AssetSelectContextMenu>
       </AssetSelectControlBar>
+    </div>
   {:else}
     <ControlAppBar on:close-button-click={() => goto(previousRoute)} backIcon={mdiArrowLeft}>
       <div class="w-full flex-1 pl-4">