fix: mobile room chat header layout

src/app/components/SpaceBar.svelte

@@ -23,20 +23,20 @@
 </script>
 
 <PageBar {...props}>
-  <div class="flex">
-    <Button onclick={back} class="place-self-start pr-3 md:hidden">
-      <Icon icon={ArrowLeft} size={7} />
+  <div class="flex min-w-0 flex-1 items-center gap-1">
+    <Button onclick={back} class="btn btn-ghost btn-square shrink-0 md:hidden">
+      <Icon icon={ArrowLeft} size={6} />
     </Button>
-    <div class="ellipsize whitespace-nowrap flex grow items-center justify-between gap-4">
-      <div class="flex flex-col">
-        <div class="flex gap-2 items-center">
+    <div class="flex min-w-0 flex-1 items-center justify-between gap-2">
+      <div class="flex min-w-0 flex-col gap-0.5">
+        <div class="flex min-w-0 items-center gap-2">
           {@render title?.()}
         </div>
-        <div class="text-xs text-primary md:hidden">
+        <div class="truncate text-xs leading-4 text-primary md:hidden">
           {displayRelayUrl(url)}
         </div>
       </div>
-      <div class="flex gap-2 items-start">
+      <div class="flex shrink-0 items-center gap-1">
         {@render action?.()}
       </div>
     </div>