feat(tunnel): switch to yamux stream proxying and connection pooling

- Introduce pooled tunnel sessions (TunnelID/DataConnect) on client/server
- Proxy HTTP/HTTPS via raw HTTP over yamux streams; pipe TCP streams directly
- Move UI/stats into internal/shared; refactor CLI tunnel helpers; drop msgpack/hpack legacy

internal/shared/ui/styles.go

@@ -0,0 +1,184 @@
+package ui
+
+import (
+	"github.com/charmbracelet/lipgloss"
+)
+
+var (
+	// Colors inspired by Vercel CLI
+	successColor   = lipgloss.Color("#0070F3")
+	warningColor   = lipgloss.Color("#F5A623")
+	errorColor     = lipgloss.Color("#E00")
+	mutedColor     = lipgloss.Color("#888")
+	highlightColor = lipgloss.Color("#0070F3")
+	cyanColor      = lipgloss.Color("#50E3C2")
+
+	// Box styles - Vercel-like clean box
+	boxStyle = lipgloss.NewStyle().
+			Border(lipgloss.RoundedBorder()).
+			Padding(1, 2).
+			MarginTop(1).
+			MarginBottom(1)
+
+	successBoxStyle = boxStyle.BorderForeground(successColor)
+
+	warningBoxStyle = boxStyle.BorderForeground(warningColor)
+
+	errorBoxStyle = boxStyle.BorderForeground(errorColor)
+
+	// Text styles
+	titleStyle = lipgloss.NewStyle().
+			Bold(true)
+
+	subtitleStyle = lipgloss.NewStyle().
+			Foreground(mutedColor)
+
+	successStyle = lipgloss.NewStyle().
+			Foreground(successColor).
+			Bold(true)
+
+	errorStyle = lipgloss.NewStyle().
+			Foreground(errorColor).
+			Bold(true)
+
+	warningStyle = lipgloss.NewStyle().
+			Foreground(warningColor).
+			Bold(true)
+
+	mutedStyle = lipgloss.NewStyle().
+			Foreground(mutedColor)
+
+	highlightStyle = lipgloss.NewStyle().
+			Foreground(highlightColor).
+			Bold(true)
+
+	cyanStyle = lipgloss.NewStyle().
+			Foreground(cyanColor)
+
+	urlStyle = lipgloss.NewStyle().
+			Foreground(highlightColor).
+			Underline(true).
+			Bold(true)
+
+	labelStyle = lipgloss.NewStyle().
+			Foreground(mutedColor).
+			Width(12)
+
+	valueStyle = lipgloss.NewStyle().
+			Bold(true)
+
+	// Table styles (padding handled manually for consistent Windows output)
+	tableHeaderStyle = lipgloss.NewStyle().
+				Foreground(mutedColor).
+				Bold(true)
+)
+
+// Success returns a styled success message
+func Success(text string) string {
+	return successStyle.Render("✓ " + text)
+}
+
+// Error returns a styled error message
+func Error(text string) string {
+	return errorStyle.Render("✗ " + text)
+}
+
+// Warning returns a styled warning message
+func Warning(text string) string {
+	return warningStyle.Render("⚠ " + text)
+}
+
+// Muted returns a styled muted text
+func Muted(text string) string {
+	return mutedStyle.Render(text)
+}
+
+// Highlight returns a styled highlighted text
+func Highlight(text string) string {
+	return highlightStyle.Render(text)
+}
+
+// Cyan returns a styled cyan text
+func Cyan(text string) string {
+	return cyanStyle.Render(text)
+}
+
+// URL returns a styled URL
+func URL(text string) string {
+	return urlStyle.Render(text)
+}
+
+// Title returns a styled title
+func Title(text string) string {
+	return titleStyle.Render(text)
+}
+
+// Subtitle returns a styled subtitle
+func Subtitle(text string) string {
+	return subtitleStyle.Render(text)
+}
+
+// KeyValue returns a styled key-value pair
+func KeyValue(key, value string) string {
+	return labelStyle.Render(key+":") + " " + valueStyle.Render(value)
+}
+
+// Info renders an info box (Vercel-style)
+func Info(title string, lines ...string) string {
+	content := titleStyle.Render(title)
+	if len(lines) > 0 {
+		content += "\n\n"
+		for i, line := range lines {
+			if i > 0 {
+				content += "\n"
+			}
+			content += line
+		}
+	}
+	return boxStyle.Render(content)
+}
+
+// SuccessBox renders a success box
+func SuccessBox(title string, lines ...string) string {
+	content := successStyle.Render("✓ " + title)
+	if len(lines) > 0 {
+		content += "\n\n"
+		for i, line := range lines {
+			if i > 0 {
+				content += "\n"
+			}
+			content += line
+		}
+	}
+	return successBoxStyle.Render(content)
+}
+
+// WarningBox renders a warning box
+func WarningBox(title string, lines ...string) string {
+	content := warningStyle.Render("⚠ " + title)
+	if len(lines) > 0 {
+		content += "\n\n"
+		for i, line := range lines {
+			if i > 0 {
+				content += "\n"
+			}
+			content += line
+		}
+	}
+	return warningBoxStyle.Render(content)
+}
+
+// ErrorBox renders an error box
+func ErrorBox(title string, lines ...string) string {
+	content := errorStyle.Render("✗ " + title)
+	if len(lines) > 0 {
+		content += "\n\n"
+		for i, line := range lines {
+			if i > 0 {
+				content += "\n"
+			}
+			content += line
+		}
+	}
+	return errorBoxStyle.Render(content)
+}