fix: read yt-dlp progress from stdout instead of stderr; add explicit --proxy support

internal/dl/progress.go

@@ -98,22 +98,16 @@ func parseProgressLine(line string) *progressUpdate {
 	return u
 }
 
-// readProgress reads yt-dlp stderr and sends progress updates to the channel.
+// readProgress reads yt-dlp output and sends progress updates to the channel.
 // The caller is responsible for closing the updates channel.
-func readProgress(stderr io.ReadCloser, updates chan<- *domain.DownloadJob, job *domain.DownloadJob) {
-	var stderrBuf strings.Builder
-	scanner := bufio.NewScanner(stderr)
+func readProgress(reader io.ReadCloser, updates chan<- *domain.DownloadJob, job *domain.DownloadJob) {
+	scanner := bufio.NewScanner(reader)
 	lineCount := 0
 	matchCount := 0
 	for scanner.Scan() {
 		line := scanner.Text()
 		lineCount++
 
-		if stderrBuf.Len() < 4096 {
-			stderrBuf.WriteString(line)
-			stderrBuf.WriteByte('\n')
-		}
-
 		parsed := parseProgressLine(line)
 		if parsed == nil {
 			continue
@@ -124,6 +118,5 @@ func readProgress(stderr io.ReadCloser, updates chan<- *domain.DownloadJob, job
 		job.ETA = parsed.eta
 		updates <- job
 	}
-	job.StderrLog = stderrBuf.String()
-	slog.Info("readProgress finished", "url", job.URL, "lines", lineCount, "matches", matchCount, "stderr_len", len(job.StderrLog))
+	slog.Info("readProgress finished", "url", job.URL, "lines", lineCount, "matches", matchCount)
 }