feat: add openrouter

tui/model.go

@@ -279,7 +279,7 @@ func (m *Model) updateViewportSize() {
 	bodyH := m.bodyHeight()
 	eventH, streamH := m.splitHeights(bodyH)
 	m.viewport.Width = centerW - 2
-	m.viewport.Height = eventH
+	m.viewport.Height = eventH - 1 // -1 为 event panel header 行
 	m.streamVP.Width = centerW - 2
 	m.streamVP.Height = streamH - 1 // -1 为 stream panel header 行
 }
@@ -366,16 +366,16 @@ func (m Model) View() string {
 		centerW := m.width - leftW - rightW
 		eventH, streamH := m.splitHeights(bodyH)
 
-		if m.viewport.Width != centerW-2 || m.viewport.Height != eventH {
+		if m.viewport.Width != centerW-2 || m.viewport.Height != eventH-1 {
 			m.viewport.Width = centerW - 2
-			m.viewport.Height = eventH
+			m.viewport.Height = eventH - 1 // -1 为 event panel header 行
 		}
 		if m.streamVP.Width != centerW-2 || m.streamVP.Height != streamH-1 {
 			m.streamVP.Width = centerW - 2
 			m.streamVP.Height = streamH - 1 // -1 为 stream panel header 行
 		}
 
-		eventFlow := renderEventFlowViewport(m.viewport, centerW, eventH)
+		eventFlow := renderEventFlowViewport(m.viewport, centerW, eventH, !m.focusStream)
 		streamPanel := renderStreamPanel(m.streamVP, centerW, streamH, m.focusStream)
 		center := lipgloss.JoinVertical(lipgloss.Left, eventFlow, streamPanel)
 

tui/panels.go

@@ -170,13 +170,30 @@ func renderEventContent(events []app.UIEvent, width int) string {
 }
 
 // renderEventFlowViewport 用 viewport 包装渲染事件流面板。
-func renderEventFlowViewport(vp viewport.Model, width, height int) string {
+func renderEventFlowViewport(vp viewport.Model, width, height int, focused bool) string {
+	// 标题栏
+	titleColor := colorDim
+	if focused {
+		titleColor = colorAccent
+	}
+	title := lipgloss.NewStyle().Foreground(titleColor).Render("✦ 事件流")
+	lineW := width - lipgloss.Width(title) - 4
+	if lineW < 0 {
+		lineW = 0
+	}
+	separator := lipgloss.NewStyle().Foreground(colorDim).Render(strings.Repeat("─", lineW))
+	header := " " + title + " " + separator
+
+	vpH := height - 1
+	if vpH < 1 {
+		vpH = 1
+	}
 	style := lipgloss.NewStyle().
 		Width(width).
-		Height(height).
+		Height(vpH).
 		Padding(0, 1)
 
-	return style.Render(vp.View())
+	return header + "\n" + style.Render(vp.View())
 }
 
 // renderStreamPanel 渲染流式输出面板（中间列下半部分）。