feat: tts support

src/lib/components/chat/Messages.svelte

@@ -28,6 +28,11 @@
 		})();
 	}
 
+	const speakMessage = (message) => {
+		const speak = new SpeechSynthesisUtterance(message);
+		speechSynthesis.speak(speak);
+	};
+
 	const createCopyCodeBlockButton = () => {
 		// use a class selector if available
 		let blocks = document.querySelectorAll('pre');
@@ -692,6 +697,30 @@
 													>
 												</button>
 
+												<button
+													class="{messageIdx + 1 === messages.length
+														? 'visible'
+														: 'invisible group-hover:visible'} p-1 rounded dark:hover:bg-gray-800 transition"
+													on:click={() => {
+														speakMessage(message.content);
+													}}
+												>
+													<svg
+														xmlns="http://www.w3.org/2000/svg"
+														fill="none"
+														viewBox="0 0 24 24"
+														stroke-width="1.5"
+														stroke="currentColor"
+														class="w-4 h-4"
+													>
+														<path
+															stroke-linecap="round"
+															stroke-linejoin="round"
+															d="M19.114 5.636a9 9 0 010 12.728M16.463 8.288a5.25 5.25 0 010 7.424M6.75 8.25l4.72-4.72a.75.75 0 011.28.53v15.88a.75.75 0 01-1.28.53l-4.72-4.72H4.51c-.88 0-1.704-.507-1.938-1.354A9.01 9.01 0 012.25 12c0-.83.112-1.633.322-2.396C2.806 8.756 3.63 8.25 4.51 8.25H6.75z"
+														/>
+													</svg>
+												</button>
+
 												{#if messageIdx + 1 === messages.length}
 													<button
 														type="button"