feat: auto-update app-dono-cliente when a new image is pushed to :latest

Adds a StepRunUpdater step that starts app-dono-updater after the app
container comes up: a poll loop (docker pull, compare image IDs,
recreate on change) baked into the official docker:cli image via
`sh -c`, reusing the same docker run argv as the initial container
start so the two can't drift.

Not built on Watchtower: containrrr/watchtower was archived upstream
in Dec 2025 with no maintained successor recommended for production
use, so this avoids taking on that dependency.

CLAUDE.md

@@ -72,9 +72,24 @@ Makefile               Multi-arch build + S3 publish.
      (writes `envs`) → `StepDownloadWireguard` → `StepRunWireguard`.
 4. Config forms: `StepAppConfig` → `StepServerConfig` → `StepDatabaseConfig` →
    `StepCertConfig`.
-5. `StepGenerateFile` — writes `config.toml` (validates numeric fields first).
+5. `StepReview` — shows all collected config; Enter confirms.
-6. `StepRunDocker` — runs `app-dono-cliente` container.
+6. `StepGenerateFile` — writes `config.toml` (validates numeric fields first).
-7. `StepDone`.
+7. `StepRunDocker` — runs `app-dono-cliente` container.
+8. `StepRunUpdater` — runs `app-dono-updater`, which auto-updates `app-dono-cliente`
+   whenever a new image is pushed to `:latest`.
+9. `StepDone`.
+
+### Navigation & error handling
+
+- **Back navigation:** `Esc` returns to the previous *input* step. The Model keeps a
+  `history []step` stack; `advance(next)` pushes the current input step, `goBack()`
+  pops. `isInputStep` ([steps.go](internal/tui/steps.go)) gates which steps participate
+  — action/wait steps (downloads, file gen, container runs) are excluded so back never
+  re-enters a side-effecting step. `Esc` is handled globally in `Update`; forms don't
+  consume it. Form values survive going back because the `FormStep`s live on the Model.
+- **Retry vs. fix:** transient failures (image pull, container run) offer `r` to re-run
+  just that command (`q`/other quits). Validation failures (file generation) route back
+  to the relevant form to correct the value instead of quitting.
 
 ## Key constants
 
@@ -82,6 +97,7 @@ In [update.go](internal/tui/update.go):
 
 - `imageName = hub.davinti.com.br:443/app-dono/app-cliente:latest`
 - `wireguardImageName = hub.davinti.com.br:443/davinti-vproxy:latest`
+- `updaterImageName = docker:cli`
 - `configPath = config.toml`, `wireguardConfigPath = envs`
 
 In [docker.go](internal/tui/docker.go): `networkName = app-dono_app` (all containers
@@ -102,6 +118,7 @@ Both are gitignored.
 | ------------------ | -------------------- | -------------------------------------------------------- |
 | `app-dono-cliente` | app-cliente          | `<host port>:8080`, mounts config.toml + cert dir, `--restart unless-stopped`, runs as host uid:gid. |
 | `vproxy`           | davinti-vproxy       | `--cap-add=NET_ADMIN`, `/dev/net/tun`, `--env-file envs`, only without public IP. |
+| `app-dono-updater` | docker:cli | Not a third-party updater — a poll loop (`sh -c`) baked into the official `docker:cli` image, since Watchtower was archived upstream in Dec 2025 with no maintained successor recommended for production. Every `updaterPollIntervalSeconds` (300s) it `docker pull`s `app-dono-cliente`'s image, compares image IDs, and if changed, stops/removes/recreates the container using the exact same `docker run` argv as the original start (`appClienteRunArgs` in `docker.go`, shared by both call sites so they can't drift). Mounts `/var/run/docker.sock` and the host's `~/.docker/config.json` (written by the earlier `docker login`) for private-registry auth. Not on `app-dono_app` — only talks to the Docker daemon. |
 
 `seccomp=unconfined` is added to either container when the "Modo Compatibilidade"
 (`seccomp_unconfined`) select is `"Sim"` — for old machines.
@@ -132,8 +149,20 @@ make push    S3_BUCKET=<bucket> VERSION=<v>   # sync dist/ to S3 (version + late
 make release S3_BUCKET=<bucket> VERSION=<v>   # per-binary copy with OS/arch naming
 ```
 
-There is no test suite. Verify changes by running `go build ./...` and exercising the
+**Versioning:** `tui.Version` ([internal/tui/version.go](internal/tui/version.go))
-TUI manually. Requires a working Docker daemon and registry access to fully run.
+defaults to `"dev"` and is stamped at build time via `VERSION_LDFLAG`
+(`-X .../internal/tui.Version=$(VERSION)`) in the Makefile. `installer --version`
+(or `-v`) prints it and exits before the TUI starts; it is also shown in the TUI
+header. A plain `go build` leaves it as `"dev"`. The Makefile build rules have no
+source deps, so `make build` will not rebuild existing `dist/` artifacts — run
+`make clean` first when re-stamping a new VERSION.
+
+Tests (`go test ./...`) cover the pure logic in
+[config_test.go](internal/tui/config_test.go) (config.toml/envs generation + numeric
+validation) and [form_test.go](internal/tui/form_test.go) (`FormStep.Values()`). The
+docker wrappers, Update and View are not unit-tested — verify those by running
+`go build ./...` and exercising the TUI manually. Fully running the installer requires
+a working Docker daemon and registry access.
 
 ## Conventions
 

Makefile

@@ -5,29 +5,32 @@ S3_BUCKET ?=
 BINARY_NAME ?= installer
 BUILD_DIR := ./dist
 
+MODULE := git.davinti.com.br/davinTI/app-dono/tui
+VERSION_LDFLAG := -X $(MODULE)/internal/tui.Version=$(VERSION)
+
 ARCHS := linux/amd64 linux/arm64 darwin/amd64 darwin/arm64 windows/amd64
 
 build: $(addprefix $(BUILD_DIR)/$(BINARY_NAME)-, $(subst /,-,$(ARCHS)))
 
 $(BUILD_DIR)/$(BINARY_NAME)-linux-amd64:
 	@mkdir -p $(BUILD_DIR)
-	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-extldflags -static" -o $@ ./cmd
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-extldflags -static $(VERSION_LDFLAG)" -o $@ ./cmd
 
 $(BUILD_DIR)/$(BINARY_NAME)-linux-arm64:
 	@mkdir -p $(BUILD_DIR)
-	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags="-extldflags -static" -o $@ ./cmd
+	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags="-extldflags -static $(VERSION_LDFLAG)" -o $@ ./cmd
 
 $(BUILD_DIR)/$(BINARY_NAME)-darwin-amd64:
 	@mkdir -p $(BUILD_DIR)
-	CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -o $@ ./cmd
+	CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags="$(VERSION_LDFLAG)" -o $@ ./cmd
 
 $(BUILD_DIR)/$(BINARY_NAME)-darwin-arm64:
 	@mkdir -p $(BUILD_DIR)
-	CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -o $@ ./cmd
+	CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -ldflags="$(VERSION_LDFLAG)" -o $@ ./cmd
 
 $(BUILD_DIR)/$(BINARY_NAME)-windows-amd64:
 	@mkdir -p $(BUILD_DIR)
-	CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -o $@ ./cmd
+	CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags="$(VERSION_LDFLAG)" -o $@ ./cmd
 
 clean:
 	rm -rf $(BUILD_DIR)

README.md

@@ -17,9 +17,12 @@ os arquivos de configuração (`config.toml` e `envs`) e sobe os containers nece
 
 ## Sumário
 
+- [App do Dono — Instalador Cliente (TUI)](#app-do-dono--instalador-cliente-tui)
+  - [Sumário](#sumário)
   - [O que ele faz](#o-que-ele-faz)
   - [Pré-requisitos](#pré-requisitos)
   - [Como usar](#como-usar)
+    - [Navegação na interface](#navegação-na-interface)
   - [Fluxo de instalação](#fluxo-de-instalação)
   - [Conectividade: IP público vs. vproxy](#conectividade-ip-público-vs-vproxy)
   - [Arquivos gerados](#arquivos-gerados)
@@ -42,7 +45,9 @@ O instalador conduz o operador por um assistente (wizard) no terminal que:
 5. Coleta, via formulários, as configurações de **aplicação, servidor, banco de dados
    e certificados**.
 6. **Gera o `config.toml`** e sobe o container `app-dono-cliente`.
-7. Exibe a confirmação de sucesso.
+7. Sobe o container **`app-dono-updater`**, que mantém o `app-dono-cliente`
+   atualizado automaticamente a cada novo push em `:latest`.
+8. Exibe a confirmação de sucesso.
 
 ## Pré-requisitos
 
@@ -80,6 +85,8 @@ go run ./cmd
 | `Shift+Tab` / `↑`  | Campo anterior                        |
 | `←` / `→`          | Alternar opção (campos de seleção)    |
 | `Enter`            | Confirmar campo / avançar etapa       |
+| `Esc`              | Voltar à etapa anterior               |
+| `r`                | Tentar novamente (em telas de erro)   |
 | Qualquer tecla     | Avançar em telas de status            |
 | `Ctrl+C`           | Sair a qualquer momento               |
 
@@ -116,12 +123,21 @@ go run ./cmd
 └────────────────────┬────────────────────┘
                      ▼
             ┌──────────────────┐
+            │ Revisão (Review) │  ← esc volta para editar
+            └────────┬─────────┘
+                     ▼
+            ┌──────────────────┐
             │ Gera config.toml │
             └────────┬─────────┘
                      ▼
             ┌──────────────────┐
             │ Sobe container   │  (app-dono-cliente)
             │ app-dono-cliente │
+            └────────┬─────────┘
+                     ▼
+            ┌──────────────────┐
+            │ Sobe container   │  (app-dono-updater,
+            │ de auto-update   │   atualiza o app-cliente sozinho)
             └────────┬─────────┘
                      ▼
                  ✅ Concluído
@@ -152,20 +168,29 @@ o instalador (no caso do `config.toml`).
 
 ## Containers e rede Docker
 
-Todos os containers são conectados à rede Docker **`app-dono_app`** (criada
+`app-dono-cliente` e `vproxy` são conectados à rede Docker **`app-dono_app`** (criada
-automaticamente se não existir).
+automaticamente se não existir). O `app-dono-updater` fica fora dessa rede — ele só fala
+com o daemon Docker via socket, não com os outros containers pela rede.
 
 | Container            | Imagem                                          | Quando sobe          |
-| ------------------ | ------------------------------------------------- | -------------------- |
+| --------------------- | ------------------------------------------------ | -------------------- |
 | `app-dono-cliente`   | `hub.davinti.com.br:443/app-dono/app-cliente`   | Sempre               |
 | `vproxy`             | `hub.davinti.com.br:443/davinti-vproxy`         | Quando não há IP púb.|
+| `app-dono-updater`   | `docker:cli`                                     | Sempre               |
 
 Características:
 
-- Ambos sobem com `--restart unless-stopped`.
+- Todos sobem com `--restart unless-stopped`.
 - O container do app expõe a porta configurada no host, mapeando para a `8080` interna,
   e monta o `config.toml` e o diretório de certificados como volumes.
 - O `vproxy` roda com `--cap-add=NET_ADMIN` e acesso a `/dev/net/tun`.
+- O `app-dono-updater` **não** é o Watchtower — esse projeto foi arquivado pelos
+  mantenedores originais em dez/2025 sem um sucessor mantido recomendado para produção.
+  Em vez disso, é um loop simples (`sh -c`) rodando na imagem oficial `docker:cli`: a
+  cada 5 minutos baixa a imagem do `app-dono-cliente`, compara com a que está rodando e,
+  se mudou, recria o container. Usa as mesmas credenciais do login feito no passo 2 (via
+  `~/.docker/config.json`) e precisa de acesso ao socket do Docker
+  (`/var/run/docker.sock`) para poder recriar o container.
 - O **modo compatibilidade** (`seccomp=unconfined`) pode ser ativado para máquinas
   antigas onde o seccomp padrão causa problemas.
 
@@ -191,6 +216,15 @@ go build -o installer ./cmd
 ./installer
 ```
 
+A versão é gravada no binário em tempo de build (`make build VERSION=1.2.0`) e pode ser
+consultada sem abrir a interface:
+
+```bash
+./installer --version   # ex.: app-dono installer 1.2.0
+```
+
+Um `go build` simples (sem o `Makefile`) deixa a versão como `dev`.
+
 ## Documentação adicional
 
 - [docs/fluxo.md](docs/fluxo.md) — detalhamento de cada etapa do assistente.

cmd/main.go

@@ -9,6 +9,14 @@ import (
 )
 
 func main() {
+	if len(os.Args) > 1 {
+		switch os.Args[1] {
+		case "--version", "-v":
+			fmt.Println("app-dono installer", tui.Version)
+			return
+		}
+	}
+
 	p := tea.NewProgram(tui.InitialModel())
 	if _, err := p.Run(); err != nil {
 		fmt.Fprintf(os.Stderr, "error: %v\n", err)

docs/TODO.md

@@ -0,0 +1,48 @@
+# TODO — UX / UI improvements
+
+Backlog of usability and interface improvements for the installer TUI. Ordered by
+value-to-effort. Status: ☐ pending · ☑ done.
+
+## High value
+
+- ☑ **1. Back navigation between steps.** Maintain a history stack of *input* steps
+  (forms + IP question + review) and bind `Esc` to go back. Action steps (download,
+  generate, run) are not part of the stack and are not re-enterable via back. Form
+  values are preserved because the `FormStep`s live on the `Model`.
+
+- ☑ **2. Review/summary step before running containers.** Show all collected config
+  (`StepReview`) for confirmation before `StepGenerateFile`/`StepRunDocker`. Natural
+  anchor for "go back and edit a section" via `Esc`.
+
+- ☑ **3. Retry instead of quit on transient errors.** Image pull / container run
+  failures offer `r: tentar novamente` (re-runs just that command) instead of throwing
+  away the whole session. Validation errors (generate file) route back to the relevant
+  form to fix the value.
+
+## Medium value
+
+- ☐ **4. Center the layout (vertically + horizontally).** Use
+  `lipgloss.Place(m.width, m.height, lipgloss.Center, lipgloss.Center, body)` — the
+  Model already tracks `width`/`height`. Caveat: every `viewXxx`/`form.View` currently
+  hardcodes a manual left pad (`strings.Repeat(" ", padding)`); to center cleanly,
+  strip that and wrap the body in one padded/bordered box, then `Place` it. Consider
+  pinning the help footer to the bottom rather than centering it with the body.
+
+- ☐ **5. Inline field validation.** Numeric validation currently happens only at file
+  write time (`WriteConfigFile`), far from input. Wire `textinput.Validate` per field
+  and render a red hint under invalid fields in `form.go`.
+
+- ☐ **6. Step indicator.** Show "Etapa N / Total" or a breadcrumb in the header. Total
+  is dynamic because the vproxy branch adds steps.
+
+## Low value / cosmetic
+
+- ☐ **7. Replace the fake progress bar.** `viewCheckDocker` animates a random-increment
+  bar for an instant `LookPath` check, then waits for a keypress. Use a spinner that
+  resolves immediately (or auto-advance on success).
+
+- ☐ **8. Bordered card + `bubbles/help` footer.** Wrap the body in a rounded
+  `lipgloss` border and render the footer via `bubbles/help` with a proper key map and
+  a `?` toggle. Pairs with #4.
+
+- ☐ **9. Password reveal toggle** (`ctrl+r`) on the login password field.

docs/configuracao.md

@@ -18,8 +18,9 @@ instalador, seus valores são usados como **padrão** nos formulários.
 | `timeout_seconds` | Servidor → Timeout            | Em segundos. Padrão `30`.                                    |
 | `environment`     | Servidor → Ambiente           | `development` ou `production`.                                |
 
-> **Atenção:** o campo "Porta" do formulário define a porta exposta no host, não a
+> **Atenção:** o campo "Porta (host)" do formulário define a porta exposta no host,
-> porta interna. O `config.toml` sempre grava `port = 8080`.
+> não a porta interna. O `config.toml` sempre grava `port = 8080` (constante
+> `containerAppPort` em `docker.go`).
 
 ### `[database]`
 

docs/fluxo.md

@@ -21,9 +21,23 @@ executadas em segundo plano. As etapas são definidas em
 | 11 | `StepServerConfig`           | Formulário do servidor (porta, timeout, ambiente, compatibilidade). |
 | 12 | `StepDatabaseConfig`         | Formulário do banco de dados.                                       |
 | 13 | `StepCertConfig`             | Formulário do diretório de certificados.                            |
-| 14 | `StepGenerateFile`           | Gera o `config.toml`.                                                |
+| 14 | `StepReview`                 | Revisão de todas as configurações antes de instalar.               |
-| 15 | `StepRunDocker`              | Sobe o container `app-dono-cliente`.                                 |
+| 15 | `StepGenerateFile`           | Gera o `config.toml`.                                                |
-| 16 | `StepDone`                   | Mensagem de sucesso.                                                 |
+| 16 | `StepRunDocker`              | Sobe o container `app-dono-cliente`.                                 |
+| 17 | `StepDone`                   | Mensagem de sucesso.                                                 |
+
+## Navegação e tratamento de erros
+
+- **Voltar (`Esc`):** retorna à etapa de entrada anterior (formulários, pergunta de IP
+  e revisão). O `Model` mantém uma pilha `history` de etapas; etapas de ação (downloads,
+  geração de arquivo, subida de container) ficam de fora e não são reexecutadas ao
+  voltar. Os valores já digitados nos formulários são preservados.
+- **Revisão (`StepReview`):** antes de gravar qualquer arquivo, todas as configurações
+  coletadas são exibidas para confirmação. `Enter` confirma e gera o `config.toml`;
+  `Esc` volta ao formulário anterior para editar.
+- **Tentar novamente:** falhas transitórias (download de imagem, subida de container)
+  oferecem `r` para reexecutar apenas aquele passo (`q` sai). Erros de validação
+  (geração de arquivo) levam de volta ao formulário correspondente para correção.
 
 ## Detalhamento
 

internal/tui/cmds.go

@@ -114,3 +114,13 @@ func RunWireguardContainer(path string, cv ConfigValues) tea.Cmd {
 		}
 	}
 }
+
+func RunUpdaterContainer(appImage, appContainerName, configPath, configDestinationPath string, cv ConfigValues) tea.Cmd {
+	return func() tea.Msg {
+		err := RunUpdaterDockerContainer(appImage, appContainerName, configPath, configDestinationPath, cv)
+
+		return DockerRunMsg{
+			Err: err,
+		}
+	}
+}

internal/tui/config.go

@@ -13,7 +13,9 @@ func GenerateConfigTOML(cv ConfigValues) (string, error) {
 	// [server]
 	sb.WriteString("# Server Configuration\n")
 	sb.WriteString("[server]\n")
-	sb.WriteString("port = 8080\n")
+	// Always containerAppPort: the container listens on this port internally; the
+	// user's port is the host-side mapping (see RunAppClienteContainer).
+	sb.WriteString(fmt.Sprintf("port = %d\n", containerAppPort))
 	sb.WriteString(fmt.Sprintf("timeout_seconds = %s\n", cv.Server["timeout"]))
 	sb.WriteString(fmt.Sprintf("environment = %q\n", cv.Server["environment"]))
 	sb.WriteString("\n")

internal/tui/config_test.go

@@ -0,0 +1,247 @@
+package tui
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/BurntSushi/toml"
+)
+
+// fullConfigValues returns a ConfigValues with every field populated with valid data.
+func fullConfigValues() ConfigValues {
+	return ConfigValues{
+		Login: map[string]string{"user": "u", "password": "p"},
+		Server: map[string]string{
+			"port":               "9090",
+			"timeout":            "45",
+			"environment":        "production",
+			"seccomp_unconfined": "Não",
+		},
+		Database: map[string]string{
+			"database_type": "postgres",
+			"database_url":  "postgres://user:pass@db:5432/app_dono_db",
+			"max_conns":     "20",
+			"min_conns":     "5",
+		},
+		Cert: map[string]string{"cert_dir_path": "/etc/app-dono/certs"},
+		Application: map[string]string{
+			"central_server_url": "https://central.example.com:8443",
+			"enrollment_token":   "tok-123",
+		},
+		Wireguard: map[string]string{
+			"privkey":    "PRIVKEY_VALUE",
+			"vip":        "127.0.0.1",
+			"psk":        "PSK_VALUE",
+			"proxy_edps": "22:127.0.0.1:22",
+			"mtu":        "1380",
+			"proto":      "UDP",
+		},
+	}
+}
+
+func TestGenerateConfigTOML_RoundTrip(t *testing.T) {
+	cv := fullConfigValues()
+
+	out, err := GenerateConfigTOML(cv)
+	if err != nil {
+		t.Fatalf("GenerateConfigTOML returned error: %v", err)
+	}
+
+	var cfg AppConfig
+	if _, err := toml.Decode(out, &cfg); err != nil {
+		t.Fatalf("generated output is not valid TOML / failed to decode: %v\n---\n%s", err, out)
+	}
+
+	if cfg.Server.Timeout != 45 {
+		t.Errorf("timeout_seconds = %d, want 45", cfg.Server.Timeout)
+	}
+	if cfg.Server.Environment != "production" {
+		t.Errorf("environment = %q, want %q", cfg.Server.Environment, "production")
+	}
+	if cfg.Database.Type != "postgres" {
+		t.Errorf("database type = %q, want %q", cfg.Database.Type, "postgres")
+	}
+	if cfg.Database.URL != "postgres://user:pass@db:5432/app_dono_db" {
+		t.Errorf("database url = %q", cfg.Database.URL)
+	}
+	if cfg.Database.MaxConns != 20 {
+		t.Errorf("max_conns = %d, want 20", cfg.Database.MaxConns)
+	}
+	if cfg.Database.MinConns != 5 {
+		t.Errorf("min_conns = %d, want 5", cfg.Database.MinConns)
+	}
+	if cfg.Certificates.DirPath != "/etc/app-dono/certs" {
+		t.Errorf("mapped_dir = %q", cfg.Certificates.DirPath)
+	}
+	if cfg.Application.CentralServerURL != "https://central.example.com:8443" {
+		t.Errorf("central_server_url = %q", cfg.Application.CentralServerURL)
+	}
+	if cfg.Application.EnrollmentToken != "tok-123" {
+		t.Errorf("enrollment_token = %q", cfg.Application.EnrollmentToken)
+	}
+}
+
+// The container always listens on containerAppPort internally; the user-provided
+// "Porta (host)" value is only the host-side mapping and must never leak into the
+// generated config.toml. This guard fails loudly if that invariant is reverted.
+func TestGenerateConfigTOML_PortIsAlwaysContainerPort(t *testing.T) {
+	cv := fullConfigValues()
+	cv.Server["port"] = "9090" // host port, must NOT appear as the config port
+
+	out, err := GenerateConfigTOML(cv)
+	if err != nil {
+		t.Fatalf("GenerateConfigTOML returned error: %v", err)
+	}
+
+	var cfg AppConfig
+	if _, err := toml.Decode(out, &cfg); err != nil {
+		t.Fatalf("failed to decode: %v", err)
+	}
+
+	if cfg.Server.Port != containerAppPort {
+		t.Errorf("config port = %d, want fixed containerAppPort %d", cfg.Server.Port, containerAppPort)
+	}
+	if strings.Contains(out, "port = 9090") {
+		t.Errorf("host port 9090 leaked into config.toml:\n%s", out)
+	}
+}
+
+func TestGenerateWireguardConfig(t *testing.T) {
+	tests := []struct {
+		name          string
+		wireguard     map[string]string
+		wantContains  []string
+		wantNotContns []string
+	}{
+		{
+			name: "all fields set",
+			wireguard: map[string]string{
+				"privkey": "PK", "vip": "10.0.0.1", "psk": "PSK",
+				"proxy_edps": "22:127.0.0.1:22", "mtu": "1400", "proto": "TCP",
+			},
+			wantContains: []string{
+				"PRIVKEY=PK", "VIP=10.0.0.1", "PSK=PSK",
+				"PROXY_EDPS=22:127.0.0.1:22", "MTU=1400", "PROTO=TCP",
+			},
+		},
+		{
+			name: "empty mtu is commented out",
+			wireguard: map[string]string{
+				"privkey": "PK", "vip": "10.0.0.1", "psk": "PSK",
+				"proxy_edps": "22:127.0.0.1:22", "mtu": "", "proto": "UDP",
+			},
+			wantContains:  []string{"# MTU=1380", "PROTO=UDP"},
+			wantNotContns: []string{"\nMTU="},
+		},
+		{
+			name: "empty proto defaults to UDP",
+			wireguard: map[string]string{
+				"privkey": "PK", "vip": "10.0.0.1", "psk": "PSK",
+				"proxy_edps": "22:127.0.0.1:22", "proto": "",
+			},
+			wantContains: []string{"PROTO=UDP"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			out, err := GenerateWireguardConfig(ConfigValues{Wireguard: tt.wireguard})
+			if err != nil {
+				t.Fatalf("GenerateWireguardConfig returned error: %v", err)
+			}
+			for _, want := range tt.wantContains {
+				if !strings.Contains(out, want) {
+					t.Errorf("output missing %q:\n%s", want, out)
+				}
+			}
+			for _, notWant := range tt.wantNotContns {
+				if strings.Contains(out, notWant) {
+					t.Errorf("output should not contain %q:\n%s", notWant, out)
+				}
+			}
+		})
+	}
+}
+
+func TestWriteConfigFile_NumericValidation(t *testing.T) {
+	numeric := []string{"port", "timeout", "max_conns", "min_conns"}
+
+	for _, field := range numeric {
+		t.Run("invalid_"+field, func(t *testing.T) {
+			cv := fullConfigValues()
+			switch field {
+			case "port", "timeout":
+				cv.Server[field] = "abc"
+			case "max_conns", "min_conns":
+				cv.Database[field] = "abc"
+			}
+
+			path := filepath.Join(t.TempDir(), "config.toml")
+			err := WriteConfigFile(cv, path)
+			if err == nil {
+				t.Fatalf("expected error for non-numeric %q, got nil", field)
+			}
+			if !strings.Contains(err.Error(), field) {
+				t.Errorf("error %q does not mention field %q", err.Error(), field)
+			}
+			if _, statErr := os.Stat(path); statErr == nil {
+				t.Errorf("file should not have been written on validation failure")
+			}
+		})
+	}
+}
+
+func TestWriteConfigFile_ValidWritesFile(t *testing.T) {
+	cv := fullConfigValues()
+	path := filepath.Join(t.TempDir(), "config.toml")
+
+	if err := WriteConfigFile(cv, path); err != nil {
+		t.Fatalf("WriteConfigFile returned error: %v", err)
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("config file was not written: %v", err)
+	}
+
+	var cfg AppConfig
+	if _, err := toml.Decode(string(data), &cfg); err != nil {
+		t.Fatalf("written file is not valid TOML: %v", err)
+	}
+}
+
+func TestWriteWireguardConfigFile_MTUValidation(t *testing.T) {
+	tests := []struct {
+		name    string
+		mtu     string
+		wantErr bool
+	}{
+		{name: "valid mtu", mtu: "1380", wantErr: false},
+		{name: "empty mtu allowed", mtu: "", wantErr: false},
+		{name: "non-numeric mtu rejected", mtu: "big", wantErr: true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cv := fullConfigValues()
+			cv.Wireguard["mtu"] = tt.mtu
+
+			path := filepath.Join(t.TempDir(), "envs")
+			err := WriteWireguardConfigFile(cv, path)
+
+			if tt.wantErr && err == nil {
+				t.Fatalf("expected error for mtu %q, got nil", tt.mtu)
+			}
+			if !tt.wantErr && err != nil {
+				t.Fatalf("unexpected error for mtu %q: %v", tt.mtu, err)
+			}
+			if !tt.wantErr {
+				if _, statErr := os.Stat(path); statErr != nil {
+					t.Errorf("envs file should have been written: %v", statErr)
+				}
+			}
+		})
+	}
+}

internal/tui/docker.go

@@ -2,6 +2,7 @@ package tui
 
 import (
 	"fmt"
+	"os"
 	"os/exec"
 	"os/user"
 	"path/filepath"
@@ -11,6 +12,10 @@ import (
 
 const networkName = "app-dono_app"
 
+// containerAppPort is the port the app cliente container listens on internally.
+// The user-provided port is only the host-side mapping (<host port>:containerAppPort).
+const containerAppPort = 8080
+
 func RunContainer(image string, name string, port int) error {
 
 	cmd := exec.Command(
@@ -102,28 +107,25 @@ func RunWireguardDockerContainer(envFilePath string, cv ConfigValues) error {
 	return verifyContainerRunning(containerID)
 }
 
-func RunAppClienteContainer(image, containerName, configPath, configDestinationPath string, cv ConfigValues) error {
+// appClienteRunArgs builds the `docker run` argv for the app-dono-cliente container.
-	removeExistingContainer(containerName)
+// Shared by RunAppClienteContainer (initial start) and RunUpdaterDockerContainer (which
-
+// re-embeds the same argv in its recreate script), so the two never drift apart.
-	if err := EnsureNetwork(networkName); err != nil {
+func appClienteRunArgs(image, containerName, configPath, configDestinationPath string, cv ConfigValues) ([]string, error) {
-		return err
-	}
-
 	absPath, err := filepath.Abs(configPath)
 	if err != nil {
-		return fmt.Errorf("erro ao resolver caminho absoluto: %w", err)
+		return nil, fmt.Errorf("erro ao resolver caminho absoluto: %w", err)
 	}
 
 	currentUser, err := user.Current()
 	if err != nil {
-		return err
+		return nil, err
 	}
 	uidGid := fmt.Sprintf("%s:%s", currentUser.Uid, currentUser.Gid)
 
 	args := []string{
 		"run", "-d",
 		"-u", uidGid,
-		"-p", fmt.Sprintf("%s:8080", cv.Server["port"]),
+		"-p", fmt.Sprintf("%s:%d", cv.Server["port"], containerAppPort),
 		"--name", containerName,
 		"--network", networkName,
 		"--restart", "unless-stopped",
@@ -134,6 +136,111 @@ func RunAppClienteContainer(image, containerName, configPath, configDestinationP
 		args = append(args, "--security-opt", "seccomp=unconfined")
 	}
 	args = append(args, image)
+	return args, nil
+}
+
+func RunAppClienteContainer(image, containerName, configPath, configDestinationPath string, cv ConfigValues) error {
+	removeExistingContainer(containerName)
+
+	if err := EnsureNetwork(networkName); err != nil {
+		return err
+	}
+
+	args, err := appClienteRunArgs(image, containerName, configPath, configDestinationPath, cv)
+	if err != nil {
+		return err
+	}
+	cmd := exec.Command("docker", args...)
+
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("docker run falhou: %w\noutput: %s", err, string(out))
+	}
+
+	time.Sleep(2 * time.Second)
+	containerID := strings.TrimSpace(string(out))
+	return verifyContainerRunning(containerID)
+}
+
+// shellQuote POSIX single-quotes s for safe embedding in the updater's poll script:
+// wrap in '...', escaping any embedded ' as '\''. Needed because cv fields (e.g.
+// cert_dir_path) are operator-entered and end up inside a shell script, not a plain
+// argv slot.
+func shellQuote(s string) string {
+	return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'"
+}
+
+func shellQuoteArgs(args []string) string {
+	quoted := make([]string, len(args))
+	for i, a := range args {
+		quoted[i] = shellQuote(a)
+	}
+	return strings.Join(quoted, " ")
+}
+
+// updaterPollIntervalSeconds is how often the updater checks the registry for a new
+// app-cliente image.
+const updaterPollIntervalSeconds = 300
+
+// RunUpdaterDockerContainer starts a tiny self-contained auto-updater for the
+// app-dono-cliente container: no third-party updater project, just the official
+// `docker:cli` image running a poll loop (docker pull, compare image IDs, recreate on
+// change) written in Go and handed to it via `sh -c`. This exists because Watchtower
+// (the previous approach) was archived upstream with no maintained drop-in successor
+// recommended for production use — see StepRunUpdater in update.go.
+//
+// It mounts the docker socket (to pull/recreate) and the host's docker config.json
+// (written by the StepDockerLogin `docker login`) so `docker pull` can authenticate
+// against the private registry.
+func RunUpdaterDockerContainer(appImage, appContainerName, configPath, configDestinationPath string, cv ConfigValues) error {
+	updaterName := "app-dono-updater"
+
+	removeExistingContainer(updaterName)
+
+	if out, err := PullImage(updaterImageName); err != nil {
+		return fmt.Errorf("erro ao baixar imagem do atualizador: %w\noutput: %s", err, out)
+	}
+
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return fmt.Errorf("erro ao localizar diretório home: %w", err)
+	}
+	dockerConfigPath := filepath.Join(home, ".docker", "config.json")
+
+	recreateArgs, err := appClienteRunArgs(appImage, appContainerName, configPath, configDestinationPath, cv)
+	if err != nil {
+		return err
+	}
+	recreateCmd := "docker " + shellQuoteArgs(recreateArgs)
+
+	script := fmt.Sprintf(`set -e
+IMAGE=%s
+NAME=%s
+while true; do
+  docker pull "$IMAGE" >/dev/null 2>&1 || true
+  CURRENT=$(docker inspect --format '{{.Image}}' "$NAME" 2>/dev/null || true)
+  LATEST=$(docker inspect --format '{{.Id}}' "$IMAGE" 2>/dev/null || true)
+  if [ -n "$LATEST" ] && [ "$CURRENT" != "$LATEST" ]; then
+    docker stop "$NAME" >/dev/null 2>&1 || true
+    docker rm "$NAME" >/dev/null 2>&1 || true
+    %s
+  fi
+  sleep %d
+done
+`, shellQuote(appImage), shellQuote(appContainerName), recreateCmd, updaterPollIntervalSeconds)
+
+	args := []string{
+		"run", "-d",
+		"--name", updaterName,
+		"--restart", "unless-stopped",
+		"-v", "/var/run/docker.sock:/var/run/docker.sock",
+		"-v", fmt.Sprintf("%s:/config.json", dockerConfigPath),
+		"--log-opt", "max-size=5m",
+		"--log-opt", "max-file=1",
+		"--entrypoint", "sh",
+		updaterImageName,
+		"-c", script,
+	}
 	cmd := exec.Command("docker", args...)
 
 	out, err := cmd.CombinedOutput()

internal/tui/docker_test.go

@@ -0,0 +1,41 @@
+package tui
+
+import (
+	"os/exec"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+// TestShellQuoteArgsRoundTrip guards the updater's poll-script generation: cv fields
+// (e.g. cert_dir_path) are operator-entered and get embedded into a shell script run
+// inside the updater container. If shellQuote/shellQuoteArgs mis-escapes a value, that's
+// a command-injection bug, not just a cosmetic one. This feeds tricky values through a
+// real `sh` and checks they come back out exactly as they went in.
+func TestShellQuoteArgsRoundTrip(t *testing.T) {
+	if _, err := exec.LookPath("sh"); err != nil {
+		t.Skip("sh not available")
+	}
+
+	cases := [][]string{
+		{"simple"},
+		{"has space"},
+		{"it's got a quote"},
+		{"$(echo injected)"},
+		{"a;b|c&d"},
+		{"back`tick`"},
+		{"multi", "arg space", "o'clock", "$HOME", "'"},
+	}
+
+	for _, args := range cases {
+		script := "printf '%s\\n' " + shellQuoteArgs(args)
+		out, err := exec.Command("sh", "-c", script).Output()
+		if err != nil {
+			t.Fatalf("sh failed for %v: %v", args, err)
+		}
+		got := strings.Split(strings.TrimRight(string(out), "\n"), "\n")
+		if !reflect.DeepEqual(got, args) {
+			t.Errorf("round trip mismatch for %v: got %v", args, got)
+		}
+	}
+}

internal/tui/form.go

@@ -17,6 +17,11 @@ const (
 	FieldTypeNumber
 )
 
+// defaultInputWidth is the visible width of text inputs before the first window-size
+// message arrives. It must be > 0 (and ideally >= the longest placeholder) so the
+// placeholder renders in full; it is overridden responsively via FormStep.SetWidth.
+const defaultInputWidth = 50
+
 type FormField struct {
 	Id          string
 	Label       string
@@ -51,6 +56,9 @@ func NewFormStep(title string, fields []FormField) FormStep {
 
 		ti := textinput.New()
 		ti.Placeholder = f.Fields[i].Placeholder
+		// A non-zero width is required for the placeholder to render in full: with the
+		// default width of 0 the textinput truncates the placeholder to its first rune.
+		ti.SetWidth(defaultInputWidth)
 		if f.Fields[i].Default != "" {
 			ti.SetValue(f.Fields[i].Default)
 		}
@@ -129,6 +137,17 @@ func (f *FormStep) Values() map[string]string {
 	return out
 }
 
+// SetWidth resizes every text input to w (selects are unaffected). Called on window
+// resize so inputs fill the available terminal width and placeholders render in full.
+func (f *FormStep) SetWidth(w int) {
+	for i := range f.Fields {
+		if f.Fields[i].Type == FieldTypeSelect {
+			continue
+		}
+		f.Fields[i].input.SetWidth(w)
+	}
+}
+
 // View
 func (f FormStep) View() string {
 	pad := strings.Repeat(" ", padding)

internal/tui/form_test.go

@@ -0,0 +1,81 @@
+package tui
+
+import (
+	"strings"
+	"testing"
+)
+
+// Guards against the bubbles bug where a text input with width 0 renders only the
+// first rune of its placeholder. NewFormStep must set a non-zero width.
+func TestPlaceholderRendersBeyondFirstRune(t *testing.T) {
+	const placeholder = "postgres://user@host/db"
+	f := NewFormStep("t", []FormField{
+		{Id: "url", Label: "URL", Placeholder: placeholder, Type: FieldTypeText},
+	})
+
+	view := f.Fields[0].input.View()
+	if !strings.Contains(view, "ostgres://user@host/db") {
+		t.Errorf("placeholder appears truncated; rendered view = %q", view)
+	}
+}
+
+func TestFormStepValues(t *testing.T) {
+	f := NewFormStep("Test", []FormField{
+		{
+			Id:      "name",
+			Label:   "Name",
+			Default: "john",
+			Type:    FieldTypeText,
+		},
+		{
+			Id:      "secret",
+			Label:   "Secret",
+			Default: "hunter2",
+			Type:    FieldTypePassword,
+		},
+		{
+			Id:      "proto",
+			Label:   "Protocol",
+			Default: "TCP",
+			Type:    FieldTypeSelect,
+			Options: []string{"UDP", "TCP"},
+		},
+		{
+			Id:      "mode",
+			Label:   "Mode",
+			Type:    FieldTypeSelect,
+			Options: []string{"a", "b", "c"},
+		},
+	})
+
+	values := f.Values()
+
+	want := map[string]string{
+		"name":   "john", // text default
+		"secret": "hunter2",
+		"proto":  "TCP", // select default resolves to the matching option
+		"mode":   "a",   // select with no default falls back to first option
+	}
+
+	for id, exp := range want {
+		if got := values[id]; got != exp {
+			t.Errorf("Values()[%q] = %q, want %q", id, got, exp)
+		}
+	}
+}
+
+func TestFormStepValues_SelectInvalidDefaultFallsBackToFirst(t *testing.T) {
+	f := NewFormStep("Test", []FormField{
+		{
+			Id:      "proto",
+			Label:   "Protocol",
+			Default: "NOPE", // not among options
+			Type:    FieldTypeSelect,
+			Options: []string{"UDP", "TCP"},
+		},
+	})
+
+	if got := f.Values()["proto"]; got != "UDP" {
+		t.Errorf("Values()[proto] = %q, want first option %q", got, "UDP")
+	}
+}

internal/tui/model.go

@@ -12,6 +12,7 @@ import (
 
 type Model struct {
 	currentStep step
+	history     []step // stack of input steps visited, for back navigation
 	cursor      int
 	width       int
 	height      int
@@ -87,13 +88,13 @@ func loadConfig() AppConfig {
 	config.Server.Environment = "production"
 
 	config.Database.Type = "postgres"
-	config.Database.URL = "postgres://usuario:senha@banco:5432/app_dono_db"
 	config.Database.MaxConns = 10
 	config.Database.MinConns = 2
 
-	config.Certificates.DirPath = "/caminho/para/diretorio"
+	// Database.URL, Certificates.DirPath and Application.CentralServerURL are
-
+	// intentionally left empty so the fields show their placeholder instead of a
-	config.Application.CentralServerURL = "https://servidor:8443"
+	// pre-filled dummy. A real config.toml (re-run) still seeds them through the
+	// decode below.
 
 	_, err := os.Stat("config.toml")
 	if err == nil {
@@ -172,7 +173,7 @@ func InitialModel() Model {
 		serverForm: NewFormStep("Servidor", []FormField{
 			{
 				Id:          "port",
-				Label:       "Porta",
+				Label:       "Porta (host)",
 				Placeholder: "8081",
 				Default:     strconv.FormatInt(cfg.Server.Port, 10),
 				Type:        FieldTypeNumber,
@@ -263,3 +264,31 @@ func InitialModel() Model {
 func (m Model) Init() tea.Cmd {
 	return tea.Batch(CheckDockerCmd(), TickCmd(), m.spinner.Tick)
 }
+
+// advance moves to the next step, recording the current step on the history stack when
+// it is an input step so that Esc can return to it. Consecutive duplicates are skipped.
+func (m *Model) advance(next step) {
+	if isInputStep(m.currentStep) {
+		if n := len(m.history); n == 0 || m.history[n-1] != m.currentStep {
+			m.history = append(m.history, m.currentStep)
+		}
+	}
+	m.currentStep = next
+}
+
+// goBack returns to the previous input step on the history stack, if any. It reports
+// whether the step changed.
+func (m *Model) goBack() bool {
+	if len(m.history) == 0 {
+		return false
+	}
+	last := m.history[len(m.history)-1]
+	m.history = m.history[:len(m.history)-1]
+	m.currentStep = last
+	return true
+}
+
+// canGoBack reports whether Esc would return to a previous step from the current one.
+func (m Model) canGoBack() bool {
+	return isInputStep(m.currentStep) && len(m.history) > 0
+}

internal/tui/nav_test.go

@@ -0,0 +1,105 @@
+package tui
+
+import "testing"
+
+func TestIsInputStep(t *testing.T) {
+	input := []step{
+		StepDockerLogin, StepIPQuestion, StepWireguardConfig,
+		StepAppConfig, StepServerConfig, StepDatabaseConfig,
+		StepCertConfig, StepReview,
+	}
+	for _, s := range input {
+		if !isInputStep(s) {
+			t.Errorf("isInputStep(%d) = false, want true", s)
+		}
+	}
+
+	action := []step{
+		StepCheckDocker, StepDockerInstall, StepDownloadImage,
+		StepGenerateWireguardFile, StepDownloadWireguard, StepRunWireguard,
+		StepGenerateFile, StepRunDocker, StepDone,
+	}
+	for _, s := range action {
+		if isInputStep(s) {
+			t.Errorf("isInputStep(%d) = true, want false", s)
+		}
+	}
+}
+
+func TestAdvancePushesInputSteps(t *testing.T) {
+	m := Model{currentStep: StepAppConfig}
+
+	m.advance(StepServerConfig)
+	if m.currentStep != StepServerConfig {
+		t.Fatalf("currentStep = %d, want StepServerConfig", m.currentStep)
+	}
+	if len(m.history) != 1 || m.history[0] != StepAppConfig {
+		t.Fatalf("history = %v, want [StepAppConfig]", m.history)
+	}
+}
+
+func TestAdvanceSkipsActionSteps(t *testing.T) {
+	// Advancing away from an action step must not record it on the stack.
+	m := Model{currentStep: StepDownloadImage}
+
+	m.advance(StepIPQuestion)
+	if len(m.history) != 0 {
+		t.Fatalf("history = %v, want empty (action step not recorded)", m.history)
+	}
+}
+
+func TestAdvanceDedupesConsecutive(t *testing.T) {
+	m := Model{currentStep: StepIPQuestion}
+
+	m.advance(StepIPQuestion) // self-advance (e.g. re-entering) must not duplicate
+	m.currentStep = StepIPQuestion
+	m.advance(StepIPQuestion)
+
+	if len(m.history) > 1 {
+		t.Fatalf("history = %v, want at most one entry", m.history)
+	}
+}
+
+func TestGoBack(t *testing.T) {
+	m := Model{currentStep: StepCertConfig, history: []step{StepAppConfig, StepServerConfig, StepDatabaseConfig}}
+
+	if !m.goBack() {
+		t.Fatal("goBack() = false, want true")
+	}
+	if m.currentStep != StepDatabaseConfig {
+		t.Errorf("currentStep = %d, want StepDatabaseConfig", m.currentStep)
+	}
+	if len(m.history) != 2 {
+		t.Errorf("history len = %d, want 2", len(m.history))
+	}
+}
+
+func TestGoBackEmptyHistory(t *testing.T) {
+	m := Model{currentStep: StepDockerLogin}
+	if m.goBack() {
+		t.Error("goBack() = true on empty history, want false")
+	}
+	if m.currentStep != StepDockerLogin {
+		t.Error("currentStep changed on empty goBack")
+	}
+}
+
+func TestCanGoBack(t *testing.T) {
+	// Input step with history -> can go back.
+	m := Model{currentStep: StepServerConfig, history: []step{StepAppConfig}}
+	if !m.canGoBack() {
+		t.Error("canGoBack() = false, want true for input step with history")
+	}
+
+	// Input step, empty history -> cannot.
+	m = Model{currentStep: StepDockerLogin}
+	if m.canGoBack() {
+		t.Error("canGoBack() = true, want false with empty history")
+	}
+
+	// Action step with history -> cannot (esc handled by the step, not global back).
+	m = Model{currentStep: StepDownloadImage, history: []step{StepDockerLogin}}
+	if m.canGoBack() {
+		t.Error("canGoBack() = true on action step, want false")
+	}
+}

internal/tui/steps.go

@@ -24,8 +24,25 @@ const (
 	StepDatabaseConfig
 	StepCertConfig
 
+	// Review
+	StepReview
+
 	// Finalizing
 	StepGenerateFile
 	StepRunDocker
+	StepRunUpdater
 	StepDone
 )
+
+// isInputStep reports whether a step collects user input and therefore participates
+// in back navigation. Action/wait steps (downloads, file generation, container runs)
+// are excluded so that "back" never re-enters a side-effecting step.
+func isInputStep(s step) bool {
+	switch s {
+	case StepDockerLogin, StepIPQuestion, StepWireguardConfig,
+		StepAppConfig, StepServerConfig, StepDatabaseConfig,
+		StepCertConfig, StepReview:
+		return true
+	}
+	return false
+}

internal/tui/update.go

@@ -11,6 +11,7 @@ import (
 const (
 	imageName           = "hub.davinti.com.br:443/app-dono/app-cliente:latest"
 	wireguardImageName  = "hub.davinti.com.br:443/davinti-vproxy:latest"
+	updaterImageName    = "docker:cli"
 	configPath          = "config.toml"
 	wireguardConfigPath = "envs"
 )
@@ -20,6 +21,12 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		switch key.String() {
 		case "ctrl+c":
 			return m, tea.Quit
+		case "esc":
+			// Global "back" on input steps. Action/wait steps handle esc themselves.
+			if m.canGoBack() {
+				m.goBack()
+				return m, nil
+			}
 		}
 	}
 
@@ -27,6 +34,19 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case tea.WindowSizeMsg:
 		m.width = msg.Width
 		m.height = msg.Height
+
+		// Fit inputs to the terminal: subtract the left padding, the "> " prompt and
+		// the cursor cell, with a sensible floor for very narrow terminals.
+		inputWidth := msg.Width - (padding * 2) - 4
+		if inputWidth < 20 {
+			inputWidth = 20
+		}
+		for _, f := range []*FormStep{
+			&m.loginForm, &m.wireguardForm, &m.appForm,
+			&m.serverForm, &m.dbForm, &m.certForm,
+		} {
+			f.SetWidth(inputWidth)
+		}
 	case spinner.TickMsg:
 		var cmd tea.Cmd
 		m.spinner, cmd = m.spinner.Update(msg)
@@ -43,7 +63,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 		if done {
 			m.configValues.Login = m.loginForm.Values()
-			m.currentStep = StepDownloadImage
+			m.advance(StepDownloadImage)
 
 			return m, DownloadImageCmd(imageName, m.configValues.Login["user"], m.configValues.Login["password"])
 		}
@@ -64,7 +84,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			m.downloadDone = false
 			m.downloadMessage = ""
 			m.downloadError = nil
-			m.currentStep = StepGenerateWireguardFile
+			m.advance(StepGenerateWireguardFile)
 
 			return m, GenerateWireguardConfigFile(m.configValues, wireguardConfigPath)
 		}
@@ -82,7 +102,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 		if done {
 			m.configValues.Application = m.appForm.Values()
-			m.currentStep = StepServerConfig
+			m.advance(StepServerConfig)
 		}
 
 		return m, cmd
@@ -91,7 +111,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 		if done {
 			m.configValues.Server = m.serverForm.Values()
-			m.currentStep = StepDatabaseConfig
+			m.advance(StepDatabaseConfig)
 		}
 
 		return m, cmd
@@ -100,7 +120,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 		if done {
 			m.configValues.Database = m.dbForm.Values()
-			m.currentStep = StepCertConfig
+			m.advance(StepCertConfig)
 		}
 
 		return m, cmd
@@ -109,19 +129,18 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 		if done {
 			m.configValues.Cert = m.certForm.Values()
-			m.currentStep = StepGenerateFile
+			m.advance(StepReview)
-
-			m.finishedFile = false
-			m.configFileError = nil
-
-			return m, GenerateConfigFile(m.configValues, configPath)
 		}
 
 		return m, cmd
+	case StepReview:
+		return m.updateReview(msg)
 	case StepGenerateFile:
 		return m.updateGenerateFile(msg)
 	case StepRunDocker:
 		return m.updateRunDocker(msg)
+	case StepRunUpdater:
+		return m.updateRunUpdater(msg)
 	case StepDone:
 		return m, tea.Quit
 	}
@@ -146,9 +165,9 @@ func (m Model) updateCheckDocker(msg tea.Msg) (tea.Model, tea.Cmd) {
 		if m.checkDockerDone && m.checkProgress == 1 {
 			if m.dockerInstalled {
 				m.loading = true
-				m.currentStep = StepDockerLogin
+				m.advance(StepDockerLogin)
 			} else {
-				m.currentStep = StepDockerInstall
+				m.advance(StepDockerInstall)
 			}
 		}
 	}
@@ -175,11 +194,19 @@ func (m Model) updateDownloadImage(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 	case tea.KeyPressMsg:
 		if m.downloadDone && m.downloadError == nil {
-			m.currentStep = StepIPQuestion
+			m.advance(StepIPQuestion)
 		} else if m.downloadDone {
+			switch msg.String() {
+			case "r":
+				m.downloadDone = false
+				m.downloadMessage = ""
+				m.downloadError = nil
+				return m, DownloadImageCmd(imageName, m.configValues.Login["user"], m.configValues.Login["password"])
+			default:
 				return m, tea.Quit
 			}
 		}
+	}
 
 	return m, nil
 }
@@ -201,11 +228,11 @@ func (m Model) updateIPQuestion(msg tea.Msg) (tea.Model, tea.Cmd) {
 		case "enter":
 			// Yes
 			if m.cursor == 0 {
-				m.currentStep = StepAppConfig
+				m.advance(StepAppConfig)
 				return m, nil
 			}
 
-			m.currentStep = StepWireguardConfig
+			m.advance(StepWireguardConfig)
 		}
 	}
 
@@ -229,9 +256,17 @@ func (m Model) updateDownloadWireguard(msg tea.Msg) (tea.Model, tea.Cmd) {
 		if m.downloadDone && m.downloadError == nil {
 			m.currentStep = StepRunWireguard
 		} else if m.downloadDone {
+			switch msg.String() {
+			case "r":
+				m.downloadDone = false
+				m.downloadMessage = ""
+				m.downloadError = nil
+				return m, DownloadImageCmd(wireguardImageName, m.configValues.Login["user"], m.configValues.Login["password"])
+			default:
 				return m, tea.Quit
 			}
 		}
+	}
 
 	return m, nil
 }
@@ -250,7 +285,12 @@ func (m Model) updateGenerateWireguardFile(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 	case tea.KeyPressMsg:
 		if m.finishedFile && m.configFileError != nil {
-			return m, tea.Quit
+			// Validation error (e.g. MTU): go back to the form to correct it. The form
+			// is the top of the history stack, so goBack lands on it without leaving a
+			// duplicate entry; fall back to a direct set if history is unexpectedly empty.
+			if !m.goBack() {
+				m.currentStep = StepWireguardConfig
+			}
 		} else if m.finishedFile && m.configFileError == nil {
 			m.currentStep = StepDownloadWireguard
 
@@ -269,9 +309,36 @@ func (m Model) updateRunWireguardDocker(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 	case tea.KeyPressMsg:
 		if m.finishedDockerRun && m.dockerRunError != nil {
+			switch msg.String() {
+			case "r":
+				m.finishedDockerRun = false
+				m.dockerRunError = nil
+				return m, RunWireguardContainer(wireguardConfigPath, m.configValues)
+			default:
 				return m, tea.Quit
+			}
 		} else if m.finishedDockerRun && m.dockerRunError == nil {
-			m.currentStep = StepAppConfig
+			m.advance(StepAppConfig)
+		}
+	}
+
+	return m, nil
+}
+
+// updateReview shows the collected configuration for confirmation before any files are
+// written. Enter confirms and generates config.toml; Esc (handled globally) goes back
+// to the previous form to edit.
+func (m Model) updateReview(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.KeyPressMsg:
+		switch msg.String() {
+		case "enter":
+			m.advance(StepGenerateFile)
+
+			m.finishedFile = false
+			m.configFileError = nil
+
+			return m, GenerateConfigFile(m.configValues, configPath)
 		}
 	}
 
@@ -286,7 +353,11 @@ func (m Model) updateGenerateFile(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 	case tea.KeyPressMsg:
 		if m.finishedFile && m.configFileError != nil {
-			return m, tea.Quit
+			// Validation error: return to the review (top of the stack) so the user can
+			// navigate back to the forms; direct set as a fallback.
+			if !m.goBack() {
+				m.currentStep = StepReview
+			}
 		} else if m.finishedFile && m.configFileError == nil {
 			m.currentStep = StepRunDocker
 
@@ -314,7 +385,63 @@ func (m Model) updateRunDocker(msg tea.Msg) (tea.Model, tea.Cmd) {
 
 	case tea.KeyPressMsg:
 		if m.finishedDockerRun && m.dockerRunError != nil {
+			switch msg.String() {
+			case "r":
+				m.finishedDockerRun = false
+				m.dockerRunError = nil
+				return m, RunAppContainer(
+					imageName,
+					"app-dono-cliente",
+					configPath,
+					fmt.Sprintf("/app/%s", configPath),
+					m.configValues,
+				)
+			default:
 				return m, tea.Quit
+			}
+		} else if m.finishedDockerRun && m.dockerRunError == nil {
+			m.currentStep = StepRunUpdater
+
+			m.finishedDockerRun = false
+			m.dockerRunError = nil
+
+			return m, RunUpdaterContainer(
+				imageName,
+				"app-dono-cliente",
+				configPath,
+				fmt.Sprintf("/app/%s", configPath),
+				m.configValues,
+			)
+		}
+	}
+
+	return m, nil
+}
+
+// updateRunUpdater starts the auto-update agent that watches the app-dono-cliente
+// container and pulls/recreates it whenever a new image is pushed to :latest.
+func (m Model) updateRunUpdater(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case DockerRunMsg:
+		m.finishedDockerRun = true
+		m.dockerRunError = msg.Err
+
+	case tea.KeyPressMsg:
+		if m.finishedDockerRun && m.dockerRunError != nil {
+			switch msg.String() {
+			case "r":
+				m.finishedDockerRun = false
+				m.dockerRunError = nil
+				return m, RunUpdaterContainer(
+					imageName,
+					"app-dono-cliente",
+					configPath,
+					fmt.Sprintf("/app/%s", configPath),
+					m.configValues,
+				)
+			default:
+				return m, tea.Quit
+			}
 		} else if m.finishedDockerRun && m.dockerRunError == nil {
 			m.currentStep = StepDone
 		}

internal/tui/version.go

@@ -0,0 +1,6 @@
+package tui
+
+// Version is the installer version. It is stamped at build time via
+// -ldflags "-X git.davinti.com.br/davinTI/app-dono/tui/internal/tui.Version=<v>"
+// (see the Makefile) and defaults to "dev" for local builds.
+var Version = "dev"

internal/tui/view.go

@@ -10,15 +10,33 @@ import (
 
 const (
 	header       = "App do Dono - Instalador Cliente"
-	defaultMsg   = "ctrl+c: sair"
 	anyKeyOutMsg = "qualquer tecla: sair"
-	formMsg      = "tab: próximo campo • enter: confirmar • ctrl+c: sair"
+	retryMsg     = "r: tentar novamente • q: sair"
+	fixMsg       = "qualquer tecla: voltar e corrigir"
+
+	formBase   = "tab: próximo campo • enter: confirmar"
+	ipBase     = "↑/↓: navegar • enter: selecionar"
+	reviewBase = "enter: confirmar e instalar"
 )
 
+// helpFor builds the footer for an input step, appending "esc: voltar" when back
+// navigation is available and always ending with "ctrl+c: sair".
+func (m Model) helpFor(base string) string {
+	parts := []string{}
+	if base != "" {
+		parts = append(parts, base)
+	}
+	if m.canGoBack() {
+		parts = append(parts, "esc: voltar")
+	}
+	parts = append(parts, "ctrl+c: sair")
+	return strings.Join(parts, " • ")
+}
+
 func (m Model) View() tea.View {
 	pad := strings.Repeat(" ", padding)
 	var body string
-	helpMsg := defaultMsg
+	helpMsg := m.helpFor("")
 
 	switch m.currentStep {
 	// Docker stuff
@@ -29,53 +47,70 @@ func (m Model) View() tea.View {
 		helpMsg = anyKeyOutMsg
 	case StepDockerLogin:
 		body = m.loginForm.View()
-		helpMsg = formMsg
+		helpMsg = m.helpFor(formBase)
 	case StepDownloadImage:
 		body = m.viewDownloadImage()
+		if m.downloadDone && m.downloadError != nil {
+			helpMsg = retryMsg
+		}
 
 	// IP Stuff
 	case StepIPQuestion:
 		body = m.viewIPQuestion()
+		helpMsg = m.helpFor(ipBase)
 	case StepWireguardConfig:
 		body = m.wireguardForm.View()
-		helpMsg = formMsg
+		helpMsg = m.helpFor(formBase)
 	case StepGenerateWireguardFile:
 		body = m.viewGenerateFile()
 		if m.finishedFile && m.configFileError != nil {
-			helpMsg = anyKeyOutMsg
+			helpMsg = fixMsg
 		}
 	case StepDownloadWireguard:
 		body = m.viewDownloadImage()
+		if m.downloadDone && m.downloadError != nil {
+			helpMsg = retryMsg
+		}
 	case StepRunWireguard:
 		body = m.viewDockerRun()
 		if m.finishedDockerRun && m.dockerRunError != nil {
-			helpMsg = anyKeyOutMsg
+			helpMsg = retryMsg
 		}
 
 	// App Config Stuff
 	case StepAppConfig:
 		body = m.appForm.View()
-		helpMsg = formMsg
+		helpMsg = m.helpFor(formBase)
 	case StepServerConfig:
 		body = m.serverForm.View()
-		helpMsg = formMsg
+		helpMsg = m.helpFor(formBase)
 	case StepDatabaseConfig:
 		body = m.dbForm.View()
-		helpMsg = formMsg
+		helpMsg = m.helpFor(formBase)
 	case StepCertConfig:
 		body = m.certForm.View()
-		helpMsg = formMsg
+		helpMsg = m.helpFor(formBase)
+
+	// Review
+	case StepReview:
+		body = m.viewReview()
+		helpMsg = m.helpFor(reviewBase)
 
 	// Finalize
 	case StepGenerateFile:
 		body = m.viewGenerateFile()
 		if m.finishedFile && m.configFileError != nil {
-			helpMsg = anyKeyOutMsg
+			helpMsg = fixMsg
 		}
 	case StepRunDocker:
 		body = m.viewDockerRun()
 		if m.finishedDockerRun && m.dockerRunError != nil {
-			helpMsg = anyKeyOutMsg
+			helpMsg = retryMsg
+		}
+	case StepRunUpdater:
+		body = m.viewDockerRun()
+		if m.finishedDockerRun && m.dockerRunError != nil {
+			helpMsg = retryMsg
 		}
 	case StepDone:
 		body = m.viewDoneMessage()
@@ -84,8 +119,10 @@ func (m Model) View() tea.View {
 
 	help := HelpStyle.Render(helpMsg)
 
+	title := TitleStyle.Render(header) + HelpStyle.Render("  v"+Version)
+
 	v := tea.NewView(fmt.Sprintf("\n%s%s\n\n%s\n\n%s%s\n",
-		pad, TitleStyle.Render(header),
+		pad, title,
 		body,
 		pad, help,
 	))
@@ -155,7 +192,7 @@ func (m Model) viewDownloadImage() string {
 		errText := dualPad + m.downloadMessage + "\n" + dualPad + m.downloadError.Error()
 		sb.WriteString(ErrorStyle.Width(m.width - (padding * 2)).Align(lipgloss.Left).Render(errText))
 
-		sb.WriteString("\n\n" + pad + "Pressione qualquer tecla para sair.")
+		sb.WriteString("\n\n" + pad + "Pressione 'r' para tentar novamente ou 'q' para sair.")
 	}
 
 	return sb.String()
@@ -187,6 +224,51 @@ func (m Model) viewIPQuestion() string {
 	return sb.String()
 }
 
+func (m Model) viewReview() string {
+	pad := strings.Repeat(" ", padding)
+	cv := m.configValues
+
+	var sb strings.Builder
+	sb.WriteString(pad + "Revise as configurações antes de instalar:\n")
+
+	section := func(title string, rows [][2]string) {
+		sb.WriteString("\n" + pad + TitleStyle.Render(title) + "\n")
+		for _, r := range rows {
+			sb.WriteString(pad + HelpStyle.Render(r[0]+": ") + r[1] + "\n")
+		}
+	}
+
+	if len(cv.Wireguard) > 0 {
+		section("vproxy", [][2]string{
+			{"IP Virtual", cv.Wireguard["vip"]},
+			{"Proxy EDPS", cv.Wireguard["proxy_edps"]},
+			{"MTU", cv.Wireguard["mtu"]},
+			{"Protocolo", cv.Wireguard["proto"]},
+		})
+	}
+
+	section("Aplicação", [][2]string{
+		{"Servidor Central", cv.Application["central_server_url"]},
+		{"Token de Inscrição", cv.Application["enrollment_token"]},
+	})
+	section("Servidor", [][2]string{
+		{"Porta (host)", cv.Server["port"]},
+		{"Timeout", cv.Server["timeout"]},
+		{"Ambiente", cv.Server["environment"]},
+		{"Modo Compatibilidade", cv.Server["seccomp_unconfined"]},
+	})
+	section("Banco de Dados", [][2]string{
+		{"Tipo", cv.Database["database_type"]},
+		{"URL", cv.Database["database_url"]},
+		{"Conexões (máx/mín)", cv.Database["max_conns"] + "/" + cv.Database["min_conns"]},
+	})
+	section("Certificado", [][2]string{
+		{"Diretório", cv.Cert["cert_dir_path"]},
+	})
+
+	return sb.String()
+}
+
 func (m Model) viewGenerateFile() string {
 	pad := strings.Repeat(" ", padding)
 	var sb strings.Builder
@@ -205,7 +287,7 @@ func (m Model) viewGenerateFile() string {
 			errText := dualPad + m.configFileError.Error()
 			sb.WriteString(ErrorStyle.Width(m.width - (padding * 2)).Align(lipgloss.Left).Render(errText))
 
-			sb.WriteString("\n\n" + pad + "Tente novamente.")
+			sb.WriteString("\n\n" + pad + "Pressione qualquer tecla para voltar e corrigir os dados.")
 		}
 	}
 
@@ -230,7 +312,7 @@ func (m Model) viewDockerRun() string {
 			errText := dualPad + m.dockerRunError.Error()
 			sb.WriteString(ErrorStyle.Width(m.width - (padding * 2)).Align(lipgloss.Left).Render(errText))
 
-			sb.WriteString("\n\n" + pad + "Tente novamente.")
+			sb.WriteString("\n\n" + pad + "Pressione 'r' para tentar novamente ou 'q' para sair.")
 		}
 	}