fix: remove setup-token option and cap autocomplete to chat area height

Problem 1: Anthropic blocked OAuth tokens (sk-ant-oat*) from API access as
of Feb 20 2026, making both the setup-token paste and OAuth PKCE flows broken.
Reduces Anthropic auth choices from 3 to 2: API key first (recommended) and
OAuth second (with restriction warning). Removes setupTokenMode field and all
references. Updates stepEnterAPIKey view to show console URL and key prefix hint.

Problem 2: Autocomplete dropdown could grow taller than the chat area. Adds
height field + SetHeight() to AutocompleteModel. View() caps visible items at
height-4 (leaving room for borders, input, status bar). relayout() in chat.go
propagates the available height to the autocomplete after each resize.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: intel352

internal/tui/components/autocomplete.go

@@ -23,15 +23,16 @@ type AutocompleteModel struct {
 	filter   string
 	cursor   int
 	visible  bool
+	height   int
 }
 
 // AutocompleteSelectedMsg is sent when a command is selected from the dropdown.
 type AutocompleteSelectedMsg struct {
 	Command string
 }
 
-// maxVisibleItems is the maximum number of autocomplete items shown at once.
-const maxVisibleItems = 10
+// defaultMaxVisibleItems is the default maximum number of autocomplete items shown at once.
+const defaultMaxVisibleItems = 10
 
 // NewAutocomplete creates an autocomplete model with all known commands.
 func NewAutocomplete() AutocompleteModel {
@@ -63,6 +64,12 @@ func NewAutocomplete() AutocompleteModel {
 // Visible returns whether the autocomplete dropdown is showing.
 func (m AutocompleteModel) Visible() bool { return m.visible }
 
+// SetHeight sets the available height so View() can cap the dropdown size.
+func (m AutocompleteModel) SetHeight(h int) AutocompleteModel {
+	m.height = h
+	return m
+}
+
 // SetFilter updates the autocomplete based on current input text.
 func (m AutocompleteModel) SetFilter(input string) AutocompleteModel {
 	// Do NOT TrimSpace — a trailing space (e.g. after autocomplete selection)
@@ -152,15 +159,27 @@ func (m AutocompleteModel) View(t theme.Theme, width int) string {
 
 	total := len(m.matches)
 
-	// Compute a window of maxVisibleItems around the cursor.
-	start := m.cursor - maxVisibleItems/2
+	// Cap visible items based on available height (leaving room for borders + input + status bar).
+	maxVisible := defaultMaxVisibleItems
+	if m.height > 0 {
+		heightCap := m.height - 4
+		if heightCap < 1 {
+			heightCap = 1
+		}
+		if heightCap < maxVisible {
+			maxVisible = heightCap
+		}
+	}
+
+	// Compute a window of maxVisible around the cursor.
+	start := m.cursor - maxVisible/2
 	if start < 0 {
 		start = 0
 	}
-	end := start + maxVisibleItems
+	end := start + maxVisible
 	if end > total {
 		end = total
-		start = end - maxVisibleItems
+		start = end - maxVisible
 		if start < 0 {
 			start = 0
 		}

internal/tui/pages/chat.go

@@ -260,6 +260,9 @@ func (m *ChatModel) relayout() {
 	m.viewport.SetWidth(m.width)
 	m.statusBar.Width = m.width
 	m.input.SetWidth(m.width)
+	// Autocomplete height = space above the input (viewport + 1 newline).
+	acHeight := vpHeight + 1
+	m.autocomplete = m.autocomplete.SetHeight(acHeight)
 	m.refreshViewport()
 }
 

internal/tui/pages/onboarding.go

@@ -134,7 +134,6 @@ type OnboardingModel struct {
 	authCancel            context.CancelFunc
 	deviceUserCode        string // device flow: code to display to user
 	deviceVerificationURI string // device flow: URL to open
-	setupTokenMode        bool   // true when user chose "Paste setup-token" for Anthropic
 
 	// Model listing
 	fetchingModels bool
@@ -208,7 +207,6 @@ func (m OnboardingModel) Update(msg tea.Msg) (OnboardingModel, tea.Cmd) {
 			}
 			m.authing = false
 			m.authError = ""
-			m.setupTokenMode = false
 			m.step = stepSelectProvider
 			// Restore cursor to the previously-selected provider so the list
 			// highlights the right row when returning to the selection screen.
@@ -435,7 +433,7 @@ func (m OnboardingModel) updateAnthropicAuthChoice(msg tea.Msg) (OnboardingModel
 			m.cursor = m.providerIdx
 			return m, nil
 		case "j", "down":
-			if m.cursor < 2 {
+			if m.cursor < 1 {
 				m.cursor++
 			}
 		case "k", "up":
@@ -446,30 +444,21 @@ func (m OnboardingModel) updateAnthropicAuthChoice(msg tea.Msg) (OnboardingModel
 			m.cursor = 0
 		case "2":
 			m.cursor = 1
-		case "3":
-			m.cursor = 2
 		case "enter", " ":
 			switch m.cursor {
 			case 0:
-				// Claude subscription OAuth
+				// Manual API key (recommended)
+				m.step = stepEnterAPIKey
+				m.apiKeyInput.Placeholder = "sk-ant-api03-..."
+				return m, m.apiKeyInput.Focus()
+			case 1:
+				// Claude subscription OAuth (may have restrictions)
 				m.step = stepBrowserAuth
 				m.authing = true
 				m.browserOpened = true
 				ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
 				m.authCancel = cancel
 				return m, tea.Batch(m.spinner.Tick, m.startAnthropicAuth(ctx))
-			case 1:
-				// Setup-token paste (from `claude setup-token`)
-				m.setupTokenMode = true
-				m.step = stepEnterAPIKey
-				m.apiKeyInput.Placeholder = "Paste setup-token here..."
-				return m, m.apiKeyInput.Focus()
-			case 2:
-				// Manual API key
-				m.setupTokenMode = false
-				m.step = stepEnterAPIKey
-				m.apiKeyInput.Placeholder = "sk-ant-..."
-				return m, m.apiKeyInput.Focus()
 			}
 		}
 	}
@@ -500,7 +489,6 @@ func (m OnboardingModel) updateEnterAPIKey(msg tea.Msg) (OnboardingModel, tea.Cm
 		case "escape":
 			m.apiKeyInput.SetValue("")
 			m.authError = ""
-			m.setupTokenMode = false
 			// Go back to Anthropic auth choice if this is an Anthropic provider
 			p := m.selectedProvider()
 			if p.auth == authBrowser {
@@ -744,9 +732,8 @@ func (m OnboardingModel) View(t theme.Theme, width, height int) string {
 	case stepAnthropicAuthChoice:
 		sb.WriteString("Sign in with Anthropic\n\n")
 		choices := []string{
-			"Sign in with Claude account (Pro/Team/Enterprise)",
-			"Paste setup-token (from claude setup-token)",
-			"Enter API key manually",
+			"Enter API key (recommended)",
+			"Sign in with Claude account (OAuth — may have restrictions)",
 		}
 		for i, label := range choices {
 			cursor := "  "
@@ -757,7 +744,7 @@ func (m OnboardingModel) View(t theme.Theme, width, height int) string {
 			}
 			sb.WriteString(style.Render(fmt.Sprintf("%s%d. %s", cursor, i+1, label)) + "\n")
 		}
-		sb.WriteString("\n" + mutedStyle.Render("↑/↓ or 1-3: select  Enter: confirm  Esc: back"))
+		sb.WriteString("\n" + mutedStyle.Render("↑/↓ or 1-2: select  Enter: confirm  Esc: back"))
 
 	case stepBrowserAuth:
 		p := m.selectedProvider()
@@ -786,26 +773,20 @@ func (m OnboardingModel) View(t theme.Theme, width, height int) string {
 
 	case stepEnterAPIKey:
 		p := m.selectedProvider()
-		if m.setupTokenMode {
-			sb.WriteString("Paste your Claude setup-token:\n\n")
-			sb.WriteString(mutedStyle.Render("Generate one by running:") + "\n")
-			sb.WriteString(lipgloss.NewStyle().Bold(true).Foreground(t.Accent).Render("  claude setup-token") + "\n\n")
-			sb.WriteString(mutedStyle.Render("This uses your Claude Pro/Team/Enterprise subscription.") + "\n\n")
-		} else {
-			switch p.auth {
-			case authBrowser:
-				sb.WriteString("Paste your Anthropic API key:\n\n")
-				sb.WriteString(mutedStyle.Render("Get one at console.anthropic.com/settings/keys") + "\n\n")
-			case authGHCLI:
-				sb.WriteString("Paste your GitHub token:\n\n")
-				sb.WriteString(mutedStyle.Render("Run: gh auth token") + "\n")
-				sb.WriteString(mutedStyle.Render("Or create a PAT at github.com/settings/tokens") + "\n\n")
-			default:
-				fmt.Fprintf(&sb, "Enter your %s API key:\n\n", p.displayName)
-			}
+		switch p.auth {
+		case authBrowser:
+			sb.WriteString("Enter your Anthropic API key:\n\n")
+			sb.WriteString(mutedStyle.Render("Get one at console.anthropic.com/settings/keys") + "\n")
+			sb.WriteString(mutedStyle.Render("Keys start with sk-ant-api03-...") + "\n\n")
+		case authGHCLI:
+			sb.WriteString("Paste your GitHub token:\n\n")
+			sb.WriteString(mutedStyle.Render("Run: gh auth token") + "\n")
+			sb.WriteString(mutedStyle.Render("Or create a PAT at github.com/settings/tokens") + "\n\n")
+		default:
+			fmt.Fprintf(&sb, "Enter your %s API key:\n\n", p.displayName)
 		}
 		sb.WriteString("Key: " + m.apiKeyInput.View() + "\n\n")
-		sb.WriteString(mutedStyle.Render("Your key is stored locally and never shared.") + "\n\n")
+		sb.WriteString(mutedStyle.Render("Your key is stored locally and never shared.") + "\n")
 		sb.WriteString(mutedStyle.Render("Enter: continue  Esc: back"))
 
 	case stepEnterBaseURL: