v0.0.2: polish tui rendering

Add visible activity state for running turns.
Move model metadata below the input area.
Render assistant Markdown with theme-aware styling.

internal/tui/theme.go

@@ -49,7 +49,9 @@ type styles struct {
 	Header         lipgloss.Style
 	Title          lipgloss.Style
 	Muted          lipgloss.Style
-	Status         lipgloss.Style
+	Activity       lipgloss.Style
+	ModelMeta      lipgloss.Style
+	Footer         lipgloss.Style
 	Viewport       lipgloss.Style
 	InputBox       lipgloss.Style
 	CommandHint    lipgloss.Style
@@ -126,11 +128,22 @@ func (t theme) styles() styles {
 		Muted: lipgloss.NewStyle().
 			Foreground(lipgloss.Color(t.Muted)),
 
-		Status: lipgloss.NewStyle().
-			Foreground(lipgloss.Color(t.Muted)).
+		Activity: lipgloss.NewStyle().
+			Bold(true).
+			Foreground(lipgloss.Color(t.Background)).
+			Background(lipgloss.Color(t.Title)).
+			Padding(0, 1),
+
+		ModelMeta: lipgloss.NewStyle().
+			Foreground(lipgloss.Color(t.Text)).
 			Background(lipgloss.Color(t.SurfaceAlt)).
 			Padding(0, 1),
 
+		Footer: lipgloss.NewStyle().
+			Foreground(lipgloss.Color(t.Muted)).
+			Background(lipgloss.Color(t.Background)).
+			Padding(0, 1),
+
 		Viewport: lipgloss.NewStyle().
 			Foreground(lipgloss.Color(t.Text)).
 			Background(lipgloss.Color(t.Background)),