Phase 5: TUI client (Bubbletea)

- cmd/tui/main.go: entry point with --server, --token, --version flags
- cmd/tui/config.go: config from ~/.config/dumpster/config.yaml or env vars
- cmd/tui/auth.go: login flow, session cookie management
- cmd/tui/api.go: HTTP client for servers, channels, messages, voice
- cmd/tui/model.go: root bubbletea model with state management
- cmd/tui/theme.go: Gruvbox dark lipgloss styles
- cmd/tui/servers.go: server bar with [D] style initials
- cmd/tui/channels.go: channel list with #text and 🔊 voice
- cmd/tui/chat.go: IRC-style message viewport with colored usernames
- cmd/tui/input.go: message input with > _ prompt
- cmd/tui/members.go: member list with ●/◐/○ status
- cmd/tui/ws.go: WebSocket client for real-time events
- cmd/tui/voice.go: voice state tracking and mute toggle
- cmd/tui/keys.go: vim-style keybindings (j/k, g/G, Tab, /, etc)
- cmd/tui/views.go: multi-pane layout rendering
- Makefile: added build-tui and run-tui targets
- go.mod/go.sum: added charmbracelet dependencies

cmd/tui/auth.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+	"syscall"
+
+	"golang.org/x/term"
+)
+
+// RunAuth performs interactive login and returns the session token.
+func RunAuth(api *APIClient) (string, error) {
+	reader := bufio.NewReader(os.Stdin)
+
+	fmt.Println(TitleStyle.Render("🗑  Dumpster Chat TUI"))
+	fmt.Println(HelpStyle.Render("  Log in to continue\n"))
+
+	fmt.Print("  Email: ")
+	email, _ := reader.ReadString('\n')
+	email = strings.TrimSpace(email)
+
+	fmt.Print("  Password: ")
+	pwBytes, err := term.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		// Fallback to plain read
+		fmt.Scanln(&email)
+		return "", fmt.Errorf("read password: %w", err)
+	}
+	fmt.Println() // newline after password
+
+	password := strings.TrimSpace(string(pwBytes))
+
+	if email == "" || password == "" {
+		return "", fmt.Errorf("email and password are required")
+	}
+
+	lr, err := api.Login(email, password)
+	if err != nil {
+		return "", fmt.Errorf("login failed: %w", err)
+	}
+
+	_ = lr // user ID available if needed
+	fmt.Println(SuccessStyle.Render("  ✓ Logged in successfully"))
+
+	return api.SessionToken, nil
+}