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/servers.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+// ServerItem renders a single server in the server bar.
+func ServerItem(server Server, isActive, isHovered bool, width int) string {
+	// Show first letter(s) of server name as icon
+	name := server.Name
+	if len(name) > 2 {
+		name = name[:2]
+	}
+	// Use icon if available
+	if server.Icon != "" {
+		name = server.Icon
+	}
+	name = strings.ToUpper(name)
+
+	style := ServerInactive
+	if isActive {
+		style = ServerActive
+	} else if isHovered {
+		style = ServerHover
+	}
+
+	return style.Width(width - 2).Render(fmt.Sprintf(" %s ", name))
+}
+
+// ServerBar renders the vertical server list.
+func ServerBar(servers []Server, activeIdx, hoverIdx, height int) string {
+	if len(servers) == 0 {
+		return ServerBarStyle.
+			Width(6).
+			Height(height).
+			Render(HelpStyle.Render("No\nservers"))
+	}
+
+	var items []string
+	for i, s := range servers {
+		items = append(items, ServerItem(s, i == activeIdx, i == hoverIdx, 6))
+	}
+
+	bar := strings.Join(items, "\n")
+	return ServerBarStyle.
+		Width(6).
+		Height(height).
+		Render(bar)
+}
+
+// ServerInitials returns 2-char initials for a server name.
+func ServerInitials(name string) string {
+	if len(name) == 0 {
+		return "??"
+	}
+	parts := strings.Fields(name)
+	if len(parts) >= 2 {
+		return strings.ToUpper(string([]rune(parts[0])[0:1]) + string([]rune(parts[1])[0:1]))
+	}
+	if len(name) >= 2 {
+		return strings.ToUpper(name[:2])
+	}
+	return strings.ToUpper(name) + " "
+}