fix: gallery viewer sliding window offload assets (#17016)

* fix: gallery viewer sliding window offload assets

* fix: update bottom sliding window

* do not use negative

* Calculate offset before gallery

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Co-authored-by: Min Idzelis <min123@gmail.com>

web/src/routes/(user)/folders/[[photos=photos]]/[[assetId=id]]/+page.svelte

@@ -154,7 +154,13 @@
     <!-- Assets -->
     {#if data.pathAssets && data.pathAssets.length > 0}
       <div bind:clientHeight={viewport.height} bind:clientWidth={viewport.width} class="mt-2">
-        <GalleryViewer assets={data.pathAssets} {assetInteraction} {viewport} showAssetName={true} />
+        <GalleryViewer
+          assets={data.pathAssets}
+          {assetInteraction}
+          {viewport}
+          showAssetName={true}
+          pageHeaderOffset={54}
+        />
       </div>
     {/if}
   </section>

web/src/routes/(user)/search/[[photos=photos]]/[[assetId=id]]/+page.svelte

@@ -368,6 +368,7 @@
         onIntersected={loadNextPage}
         showArchiveIcon={true}
         {viewport}
+        pageHeaderOffset={54}
       />
     {:else if !isLoading}
       <div class="flex min-h-[calc(66vh_-_11rem)] w-full place-content-center items-center dark:text-white">