Improve pinned video layout

src/app/components/VideoCallContent.svelte

@@ -222,7 +222,7 @@
         </div>
       {:else if useMultiGrid}
         <div
-          class="grid min-h-0 flex-1 auto-rows-fr grid-cols-1 gap-2 overflow-y-auto sm:grid-cols-2">
+          class="grid min-h-0 flex-1 grid-cols-1 content-start gap-2 overflow-y-auto sm:grid-cols-2">
           {#each tiles as tile (tileKey(tile))}
             {@render videoTile(tile, "default")}
           {/each}

src/routes/spaces/[relay]/[h]/+page.svelte

@@ -551,6 +551,8 @@
   class={cx(
     "chat__compose-zone flex flex-col gap-1 bg-base-200 md:flex-row md:gap-0",
     voiceConnectedHere && voiceDesktopPanel === "split" && "cw-split-chat",
+    pageContentHiddenDesktopVideoOnly && "md:hidden",
+    showMobileVideoPanel && "max-md:hidden",
   )}
   bind:this={chatCompose}>
   <div class="chat__compose-inner min-w-0 flex-1">