Expose version/build metadata and improve provider error messaging

internal/app/app.go

@@ -27,16 +27,19 @@ type App struct {
 	input        io.Reader
 	output       io.Writer
 	status       string
+	version      string
+	build        string
 	streamBuffer strings.Builder
 }
 
 // New constructs a new App instance.
 func New(logger *slog.Logger, cfg *config.Config, opts ...Option) *App {
 	app := &App{
-		logger: logger,
-		config: cfg,
-		input:  os.Stdin,
-		output: os.Stdout,
+		logger:  logger,
+		config:  cfg,
+		input:   os.Stdin,
+		output:  os.Stdout,
+		version: "dev",
 	}
 
 	for _, opt := range opts {
@@ -64,6 +67,20 @@ func WithIO(in io.Reader, out io.Writer) Option {
 	}
 }
 
+// WithVersion sets the application version string presented in the UI header.
+func WithVersion(version string) Option {
+	return func(a *App) {
+		a.version = strings.TrimSpace(version)
+	}
+}
+
+// WithBuild sets the application build identifier presented in the UI header.
+func WithBuild(build string) Option {
+	return func(a *App) {
+		a.build = strings.TrimSpace(build)
+	}
+}
+
 // Run starts the application lifecycle.
 func (a *App) Run(ctx context.Context) error {
 	if a == nil {
@@ -201,7 +218,15 @@ func (a *App) runCLILoop(ctx context.Context) error {
 		}
 		a.clearStreamingContent()
 
-		a.setStatus("")
+		notice := ""
+		if a.chat != nil {
+			notice = a.chat.ConsumeStreamingNotice()
+		}
+		if strings.TrimSpace(notice) != "" {
+			a.setStatus("%s", notice)
+		} else {
+			a.setStatus("")
+		}
 
 		if err := a.maybeSuggestSessionName(ctx); err != nil {
 			a.logger.WarnContext(ctx, "session name suggestion failed", "error", err)
@@ -386,7 +411,15 @@ func (a *App) renderUI() error {
 		sessionName = a.chat.SessionName()
 	}
 
-	title := fmt.Sprintf("goaichat - %s", sessionName)
+	name := "goaichat"
+	if v := strings.TrimSpace(a.version); v != "" {
+		name = fmt.Sprintf("%s v%s", name, v)
+	}
+	if b := strings.TrimSpace(a.build); b != "" {
+		name = fmt.Sprintf("%s (build %s)", name, b)
+	}
+
+	title := fmt.Sprintf("%s - %s", name, sessionName)
 	underline := strings.Repeat("=", len(title))
 	if _, err := fmt.Fprintf(a.output, "%s\n%s\n\n", title, underline); err != nil {
 		return err