fix(validation): check validateUrl return value before proceeding

Previously validateUrl() was called but its boolean return value was
ignored in audio.ts, metadata.ts, and video.ts. Invalid URLs would
pass through and only fail later during yt-dlp execution.

Now properly throw 'Invalid or unsupported URL format' error early.

src/modules/audio.ts

@@ -31,9 +31,11 @@ import { _spawnPromise, validateUrl, getFormattedTimestamp, isYouTubeUrl } from
 export async function downloadAudio(url: string, config: Config): Promise<string> {
   const timestamp = getFormattedTimestamp();
 
-  try {
-    validateUrl(url);
+  if (!validateUrl(url)) {
+    throw new Error("Invalid or unsupported URL format");
+  }
 
+  try {
     const outputTemplate = path.join(
       config.file.downloadsDir,
       sanitizeFilename(`%(title)s [%(id)s] ${timestamp}`, config.file) + '.%(ext)s'

src/modules/metadata.ts

@@ -151,7 +151,9 @@ export async function getVideoMetadata(
   _config?: Config
 ): Promise<string> {
   // Validate the URL
-  validateUrl(url);
+  if (!validateUrl(url)) {
+    throw new Error("Invalid or unsupported URL format");
+  }
 
   const args = [
     "--dump-json",

src/modules/video.ts

@@ -54,8 +54,11 @@ export async function downloadVideo(
 ): Promise<string> {
   const userDownloadsDir = config.file.downloadsDir;
 
+  if (!validateUrl(url)) {
+    throw new Error("Invalid or unsupported URL format");
+  }
+
   try {
-    validateUrl(url);
     const timestamp = getFormattedTimestamp();
 
     let format: string;