enh: prepend image filename with prompt

src/lib/components/chat/Messages/ResponseMessage.svelte

@@ -344,7 +344,7 @@
 						{#each message.files as file}
 							<div>
 								{#if file.type === 'image'}
-									<Image src={file.url} />
+									<Image src={file.url} alt={message.content} />
 								{/if}
 							</div>
 						{/each}

src/lib/components/common/ImagePreview.svelte

@@ -9,14 +9,14 @@
 
 	let previewElement = null;
 
-	const downloadImage = (url, filename) => {
+	const downloadImage = (url, filename, prefixName = '') => {
 		fetch(url)
 			.then((response) => response.blob())
 			.then((blob) => {
 				const objectUrl = window.URL.createObjectURL(blob);
 				const link = document.createElement('a');
 				link.href = objectUrl;
-				link.download = filename;
+				link.download = `${prefixName}${filename}`;
 				document.body.appendChild(link);
 				link.click();
 				document.body.removeChild(link);
@@ -87,7 +87,7 @@
 				<button
 					class=" p-5"
 					on:click={() => {
-						downloadImage(src, src.substring(src.lastIndexOf('/') + 1));
+						downloadImage(src, src.substring(src.lastIndexOf('/') + 1), alt);
 					}}
 				>
 					<svg