chore: tailwindcss v4 and z-war clean up (#18358)

* chore: styling tweak

* replace full-screen-modal, update docs

* scrubber

* fix: control app bar in memory viewer

* face lift

* pr feedback

* clean up

web/src/lib/components/memory-page/memory-viewer.svelte

@@ -314,8 +314,9 @@
 />
 
 {#if assetInteraction.selectionActive}
-  <div class="sticky top-0">
+  <div class="sticky top-0 z-1">
     <AssetSelectControlBar
+      forceDark
       assets={assetInteraction.selectedAssets}
       clearSelect={() => cancelMultiselect(assetInteraction)}
     >
@@ -605,6 +606,7 @@
     </section>
   {/if}
 </section>
+
 {#if current}
   <!-- GALLERY VIEWER -->
   <section class="bg-immich-dark-gray p-4">