refac: call overlay

src/lib/components/chat/MessageInput/CallOverlay.svelte

@@ -612,7 +612,7 @@
 							>
 								{emoji}
 							</div>
-						{:else if loading}
+						{:else if loading || assistantSpeaking}
 							<svg
 								class="size-12 text-gray-900 dark:text-gray-400"
 								viewBox="0 0 24 24"
@@ -687,7 +687,7 @@
 								>
 									{emoji}
 								</div>
-							{:else if loading}
+							{:else if loading || assistantSpeaking}
 								<svg
 									class="size-44 text-gray-900 dark:text-gray-400"
 									viewBox="0 0 24 24"