chore(deps): update all dependencies and GitHub Actions to latest

- Go deps: cobra 1.10.2, fatih/color 1.19, tablewriter 1.1.4,
  anacrolix/torrent 1.61, charmbracelet/huh 1.0, pion/webrtc 4.2.11
- GitHub Actions: checkout v6, setup-go v6, golangci-lint-action v9,
  codecov-action v5, ghaction-upx v4, goreleaser-action v7
- CI matrix: drop Go 1.22, test on 1.24 + 1.25
- Migrate tablewriter API from v0 to v1 (breaking change)
- Fix data race in WSTransport.readLoop (pass conn as parameter)
- Add file.Sync() before close in debrid and usenet downloaders
- Improve progress tracker: dedup MarkDone, re-mark dirty on flush error

internal/engine/debrid.go

@@ -182,7 +182,12 @@ func (d *DebridDownloader) Download(ctx context.Context, task *Task, outputDir s
 	if err != nil {
 		return nil, fmt.Errorf("open file: %w", err)
 	}
-	defer file.Close()
+	defer func() {
+		if err := file.Sync(); err != nil {
+			log.Printf("[%s] sync warning: %v", shortID(task.ID), err)
+		}
+		file.Close()
+	}()
 
 	// Download with progress reporting
 	downloaded := startOffset