fix: emit distinct status messages for individual tracks during download

- yt-dlp downloads video and audio streams sequentially, causing the progress bar to reset when switching streams.
- The status message was previously hardcoded to 'Downloading Media' and overwrote track change indicators.
- Now, when yt-dlp starts a new stream, the status message clearly reads 'Downloading Video Track', 'Downloading Audio Track', etc., explaining the progress reset to the user.

Sources/Firelink/DownloadController.swift

@@ -572,9 +572,6 @@ final class DownloadController: ObservableObject {
                                         $0.etaText = progress.etaText
                                     }
                                     $0.connectionCount = progress.connectionCount
-                                    if $0.message == "Starting" {
-                                        $0.message = "Downloading Media"
-                                    }
                                 }
                             }
                         },

Sources/Firelink/MediaDownloadEngine.swift

@@ -263,6 +263,7 @@ final class YTDLPOutputHandler: @unchecked Sendable {
     private let outputPathTracker: YTDLPOutputPathTracker
     private let progress: @Sendable (DownloadProgress) -> Void
     private let messageUpdate: @Sendable (String) -> Void
+    private var trackCount = 0
 
     init(
         parser: YTDLPProgressParser,
@@ -280,18 +281,17 @@ final class YTDLPOutputHandler: @unchecked Sendable {
         for line in text.split(whereSeparator: \.isNewline) {
             let stringLine = String(line)
             outputPathTracker.observe(stringLine)
-            if let update = parser.parse(stringLine) {
-                progress(update)
-                messageUpdate("Downloading Media")
-            } else if let message = statusMessage(for: stringLine) {
+            if let message = statusMessage(for: stringLine) {
                 messageUpdate(message)
+            } else if let update = parser.parse(stringLine) {
+                progress(update)
             }
         }
     }
 
     private func statusMessage(for line: String) -> String? {
         if line.contains("[Merger]") || line.contains("[ExtractAudio]") || line.contains("[Fixup") {
-            return "Processing Media..."
+            return "Merging Media Tracks..."
         }
         if line.contains("[youtube]") && line.localizedCaseInsensitiveContains("Downloading") {
             return "Fetching YouTube data..."
@@ -309,7 +309,14 @@ final class YTDLPOutputHandler: @unchecked Sendable {
             return "YouTube challenge solver unavailable"
         }
         if line.contains("Destination:") {
-            return "Starting media download..."
+            trackCount += 1
+            if trackCount == 1 {
+                return "Downloading Video Track"
+            } else if trackCount == 2 {
+                return "Downloading Audio Track"
+            } else {
+                return "Downloading Track \(trackCount)"
+            }
         }
         return nil
     }