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/keys.go

@@ -0,0 +1,88 @@
+package main
+
+import "github.com/charmbracelet/bubbles/key"
+
+type keyMap struct {
+	Up           key.Binding
+	Down         key.Binding
+	Top          key.Binding
+	Bottom       key.Binding
+	Tab          key.Binding
+	ShiftTab     key.Binding
+	FocusInput   key.Binding
+	Unfocus      key.Binding
+	Quit         key.Binding
+	Help         key.Binding
+	Send         key.Binding
+	MemberToggle key.Binding
+	ChannelPicker key.Binding
+}
+
+var keys = keyMap{
+	Up: key.NewBinding(
+		key.WithKeys("k", "up"),
+		key.WithHelp("k/↑", "up"),
+	),
+	Down: key.NewBinding(
+		key.WithKeys("j", "down"),
+		key.WithHelp("j/↓", "down"),
+	),
+	Top: key.NewBinding(
+		key.WithKeys("g"),
+		key.WithHelp("g", "top"),
+	),
+	Bottom: key.NewBinding(
+		key.WithKeys("G"),
+		key.WithHelp("G", "bottom"),
+	),
+	Tab: key.NewBinding(
+		key.WithKeys("tab"),
+		key.WithHelp("tab", "next pane"),
+	),
+	ShiftTab: key.NewBinding(
+		key.WithKeys("shift+tab"),
+		key.WithHelp("shift+tab", "prev pane"),
+	),
+	FocusInput: key.NewBinding(
+		key.WithKeys("i"),
+		key.WithHelp("i", "focus input"),
+	),
+	Unfocus: key.NewBinding(
+		key.WithKeys("esc"),
+		key.WithHelp("esc", "unfocus"),
+	),
+	Quit: key.NewBinding(
+		key.WithKeys("q", "ctrl+c"),
+		key.WithHelp("q", "quit"),
+	),
+	Help: key.NewBinding(
+		key.WithKeys("?"),
+		key.WithHelp("?", "help"),
+	),
+	Send: key.NewBinding(
+		key.WithKeys("enter"),
+		key.WithHelp("enter", "send"),
+	),
+	MemberToggle: key.NewBinding(
+		key.WithKeys("m"),
+		key.WithHelp("m", "toggle members"),
+	),
+	ChannelPicker: key.NewBinding(
+		key.WithKeys("/"),
+		key.WithHelp("/", "channels"),
+	),
+}
+
+// helpItems returns relevant help items based on the current focus.
+func helpItems(focused focusArea) []key.Binding {
+	switch focused {
+	case focusInput:
+		return []key.Binding{keys.Send, keys.Unfocus}
+	default:
+		return []key.Binding{
+			keys.Up, keys.Down, keys.Top, keys.Bottom,
+			keys.Tab, keys.FocusInput, keys.MemberToggle,
+			keys.ChannelPicker, keys.Help, keys.Quit,
+		}
+	}
+}