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/input.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"github.com/charmbracelet/bubbles/textinput"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+)
+
+// NewInput creates a configured text input for message composition.
+func NewInput() textinput.Model {
+	ti := textinput.New()
+	ti.Placeholder = "Type a message..."
+	ti.Focus()
+	ti.CharLimit = 4000
+	ti.Width = 60
+
+	ti.PromptStyle = lipgloss.NewStyle().Foreground(aqua).Bold(true)
+	ti.TextStyle = lipgloss.NewStyle().Foreground(fg)
+	ti.Cursor.Style = lipgloss.NewStyle().Foreground(aqua)
+	ti.PlaceholderStyle = lipgloss.NewStyle().Foreground(fgF)
+
+	return ti
+}
+
+// InputUpdate handles key events for the input when focused.
+func InputUpdate(input textinput.Model, msg tea.KeyMsg) (textinput.Model, tea.Cmd) {
+	switch msg.String() {
+	case "enter":
+		// Send message - handled by parent model
+		return input, nil
+	case "esc":
+		// Unfocus - handled by parent model
+		return input, nil
+	}
+
+	var cmd tea.Cmd
+	input, cmd = input.Update(msg)
+	return input, cmd
+}