debug: add comprehensive logging for TorBox state transition

Add logging at key points in the download flow to diagnose why TorBox
downloads get stuck in 'downloading' state despite completion:

- Log initial state at processFiles start
- Log when download loop exits
- Log when onSuccess callback is invoked
- Log condition evaluation in updateTorrent
- Log when state is set to pausedUP

Also fix missing return after onFailed for empty symlink path edge case.

Part of dcy-355 investigation.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pkg/wire/torrent.go

@@ -53,6 +53,12 @@ func (s *Store) processFiles(torrent *Torrent, debridTorrent *types.Torrent, imp
 		return
 	}
 
+	s.logger.Debug().
+		Str("torrent_name", debridTorrent.Name).
+		Str("debrid_status", debridTorrent.Status).
+		Str("torrent_state", torrent.State).
+		Msg("processFiles started")
+
 	deb := s.debrid.Debrid(debridTorrent.Debrid)
 	client := deb.Client()
 	downloadingStatuses := client.GetDownloadingStatus()
@@ -96,6 +102,12 @@ func (s *Store) processFiles(torrent *Torrent, debridTorrent *types.Torrent, imp
 		nextInterval := min(s.refreshInterval*2, 30*time.Second)
 		backoff.Reset(nextInterval)
 	}
+
+	s.logger.Debug().
+		Str("torrent_name", debridTorrent.Name).
+		Str("debrid_status", debridTorrent.Status).
+		Msg("Download loop exited, proceeding to post-processing")
+
 	var torrentSymlinkPath, torrentRclonePath string
 	debridTorrent.Arr = _arr
 
@@ -114,6 +126,11 @@ func (s *Store) processFiles(torrent *Torrent, debridTorrent *types.Torrent, imp
 	}
 
 	onSuccess := func(torrentSymlinkPath string) {
+		s.logger.Debug().
+			Str("torrent_name", debridTorrent.Name).
+			Str("symlink_path", torrentSymlinkPath).
+			Str("debrid_status", debridTorrent.Status).
+			Msg("onSuccess called")
 		torrent.TorrentPath = torrentSymlinkPath
 		s.updateTorrent(torrent, debridTorrent)
 		s.logger.Info().Msgf("Adding %s took %s", debridTorrent.Name, time.Since(timer))
@@ -201,6 +218,7 @@ func (s *Store) processFiles(torrent *Torrent, debridTorrent *types.Torrent, imp
 		if torrentSymlinkPath == "" {
 			err = fmt.Errorf("symlink path is empty for %s", debridTorrent.Name)
 			onFailed(err)
+			return
 		}
 		onSuccess(torrentSymlinkPath)
 		return
@@ -320,6 +338,13 @@ func (s *Store) updateTorrent(t *Torrent, debridTorrent *types.Torrent) *Torrent
 		return t
 	}
 
+	s.logger.Debug().
+		Str("torrent_name", t.Name).
+		Str("debrid_status", debridTorrent.Status).
+		Str("torrent_path", t.TorrentPath).
+		Str("current_state", t.State).
+		Msg("updateTorrent called")
+
 	if debridClient := s.debrid.Clients()[debridTorrent.Debrid]; debridClient != nil {
 		if debridTorrent.Status != "downloaded" {
 			_ = debridClient.UpdateTorrent(debridTorrent)
@@ -332,6 +357,9 @@ func (s *Store) updateTorrent(t *Torrent, debridTorrent *types.Torrent) *Torrent
 	// This is a direct fix for TorBox where IsReady() might fail due to
 	// progress/AmountLeft calculation issues.
 	if debridTorrent.Status == "downloaded" && t.TorrentPath != "" {
+		s.logger.Debug().
+			Str("torrent_name", t.Name).
+			Msg("Setting state to pausedUP (downloaded + path)")
 		t.State = "pausedUP"
 		t.Progress = 1.0
 		t.AmountLeft = 0
@@ -339,7 +367,20 @@ func (s *Store) updateTorrent(t *Torrent, debridTorrent *types.Torrent) *Torrent
 		return t
 	}
 
+	// Log why the primary condition failed
+	s.logger.Debug().
+		Str("torrent_name", t.Name).
+		Str("debrid_status", debridTorrent.Status).
+		Str("torrent_path", t.TorrentPath).
+		Bool("is_ready", t.IsReady()).
+		Float64("progress", t.Progress).
+		Int64("amount_left", t.AmountLeft).
+		Msg("Primary pausedUP condition failed, checking IsReady")
+
 	if t.IsReady() {
+		s.logger.Debug().
+			Str("torrent_name", t.Name).
+			Msg("Setting state to pausedUP (IsReady=true)")
 		t.State = "pausedUP"
 		s.torrents.Update(t)
 		return t