feat: Enhance export with IPs and add controls legend to TUI

internal/tui/model.go

@@ -401,7 +401,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		leftW := innerW / 2
 		rightW := innerW - leftW
 
-		leftTotalH := m.height - 3
+		leftTotalH := m.height - 4 // -4 for Nav, Status, and Help Footer
 		leftTopH := leftTotalH / 3
 		if leftTopH < 10 {
 			leftTopH = 10
@@ -927,7 +927,7 @@ func (m Model) renderCallDetail() string {
 	rightW := innerW - leftW
 
 	// Left Pane Heights
-	leftTotalH := m.height - 3 // Nav + Status
+	leftTotalH := m.height - 4 // Nav + Status + Help Footer
 	// Adjust for borders: we have two boxes stacked.
 	// Let's say we split space 33% / 66%.
 	leftTopH := leftTotalH / 3
@@ -1048,7 +1048,10 @@ func (m Model) renderCallDetail() string {
 	rightContent := lipgloss.JoinVertical(lipgloss.Left, flowTitle, "\n", m.viewport.View())
 	rightRendered := rightStyle.Render(rightContent)
 
-	return lipgloss.JoinHorizontal(lipgloss.Top, leftCol, rightRendered)
+	content := lipgloss.JoinHorizontal(lipgloss.Top, leftCol, rightRendered)
+
+	help := m.styles.Help.Render("[Tab] Switch Pane • [↑/↓] Scroll • [e] Export Log • [Esc] Back")
+	return lipgloss.JoinVertical(lipgloss.Left, content, help)
 }
 
 func (m Model) renderNav() string {
@@ -1481,7 +1484,14 @@ func (m *Model) exportCallToLog(flow *sip.CallFlow, filename string) error {
 
 		// Resolve IPs
 		src := m.networkMap.LabelForIP(pkt.SourceIP)
+		if src != pkt.SourceIP {
+			src = fmt.Sprintf("%s (%s)", src, pkt.SourceIP)
+		}
+
 		dst := m.networkMap.LabelForIP(pkt.DestIP)
+		if dst != pkt.DestIP {
+			dst = fmt.Sprintf("%s (%s)", dst, pkt.DestIP)
+		}
 
 		fmt.Fprintf(f, "%d. [%s] %s %s %s (%s line %d)\n",
 			i+1,