Add help screen, connection indicators, README and release builds (M7)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

cmd/arr-tui/main.go

@@ -10,6 +10,9 @@ import (
 	"git.stinnesbeck.com/nils/arr-tui/internal/ui"
 )
 
+// version is set at build time: -ldflags "-X main.version=v0.1.0".
+var version = "dev"
+
 func main() {
 	if err := run(); err != nil {
 		fmt.Fprintln(os.Stderr, "arr-tui:", err)
@@ -19,8 +22,14 @@ func main() {
 
 func run() error {
 	path := flag.String("config", "", "path to config.json (default: $XDG_CONFIG_HOME/arr-tui/config.json)")
+	showVersion := flag.Bool("version", false, "print the version and exit")
 	flag.Parse()
 
+	if *showVersion {
+		fmt.Println("arr-tui", version)
+		return nil
+	}
+
 	if *path == "" {
 		p, err := config.DefaultPath()
 		if err != nil {