feat: user stt language

src/lib/components/chat/Chat.svelte

@@ -591,9 +591,20 @@
 				throw new Error('Created file is empty');
 			}
 
+			// If the file is an audio file, provide the language for STT.
+			let metadata = null;
+			if (
+				(file.type.startsWith('audio/') || file.type.startsWith('video/')) &&
+				$settings?.audio?.stt?.language
+			) {
+				metadata = {
+					language: $settings?.audio?.stt?.language
+				};
+			}
+
 			// Upload file to server
 			console.log('Uploading file to server...');
-			const uploadedFile = await uploadFile(localStorage.token, file);
+			const uploadedFile = await uploadFile(localStorage.token, file, metadata);
 
 			if (!uploadedFile) {
 				throw new Error('Server returned null response for file upload');