feat: colored permission mode indicators on separator lines

Each permission mode has a distinct color:
- bypass: green, default: blue, plan: teal
- accept_edits: purple, auto: peach, deny: red

Top separator line shows mode label on right side in mode color.
Both separator lines (above/below input) colored to match.
Shift+Tab cycling visually changes the line colors.

internal/tui/app.go

@@ -336,7 +336,7 @@ func (m Model) View() tea.View {
 
 	status := m.renderStatus()
 	input := m.renderInput()
-	sepLine := sLine.Width(m.width).Render(strings.Repeat("─", m.width))
+	topLine, bottomLine := m.renderSeparators()
 
 	// Fixed: status bar + separator + input + separator = bottom area
 	statusH := lipgloss.Height(status)
@@ -347,9 +347,9 @@ func (m Model) View() tea.View {
 
 	v := tea.NewView(lipgloss.JoinVertical(lipgloss.Left,
 		chat,
-		sepLine,
+		topLine,
 		input,
-		sepLine,
+		bottomLine,
 		status,
 	))
 	v.MouseMode = tea.MouseModeCellMotion
@@ -493,6 +493,40 @@ func (m Model) renderMessage(msg chatMessage) []string {
 	return lines
 }
 
+func (m Model) renderSeparators() (string, string) {
+	// Get mode color
+	lineColor := cSurface // default dim
+	modeLabel := ""
+
+	if m.config.Permissions != nil {
+		mode := m.config.Permissions.Mode()
+		lineColor = ModeColor(mode)
+		modeLabel = string(mode)
+	}
+
+	lineStyle := lipgloss.NewStyle().Foreground(lineColor)
+	labelStyle := lipgloss.NewStyle().Foreground(lineColor).Bold(true)
+
+	// Top line: ─── with mode label on right ─── bypass ───
+	label := " " + modeLabel + " "
+	labelW := lipgloss.Width(labelStyle.Render(label))
+	lineW := m.width - labelW
+	if lineW < 4 {
+		lineW = 4
+	}
+	leftW := lineW - 2
+	rightW := 2
+
+	topLine := lineStyle.Render(strings.Repeat("─", leftW)) +
+		labelStyle.Render(label) +
+		lineStyle.Render(strings.Repeat("─", rightW))
+
+	// Bottom line: plain colored line
+	bottomLine := lineStyle.Render(strings.Repeat("─", m.width))
+
+	return topLine, bottomLine
+}
+
 func (m Model) renderInput() string {
 	return "  " + m.input.View()
 }

internal/tui/theme.go

@@ -1,6 +1,11 @@
 package tui
 
-import "charm.land/lipgloss/v2"
+import (
+	"image/color"
+
+	"charm.land/lipgloss/v2"
+	"somegit.dev/Owlibou/gnoma/internal/permission"
+)
 
 // Color palette — catppuccin mocha inspired
 var (
@@ -9,6 +14,8 @@ var (
 	cGreen   = lipgloss.Color("#A6E3A1") // green
 	cRed     = lipgloss.Color("#F38BA8") // red
 	cYellow  = lipgloss.Color("#F9E2AF") // yellow
+	cPeach   = lipgloss.Color("#FAB387") // peach
+	cTeal    = lipgloss.Color("#94E2D5") // teal
 	cText    = lipgloss.Color("#CDD6F4") // text
 	cSubtext = lipgloss.Color("#A6ADC8") // subtext0
 	cOverlay = lipgloss.Color("#6C7086") // overlay0
@@ -17,6 +24,24 @@ var (
 	cMantle  = lipgloss.Color("#181825") // mantle
 )
 
+// Permission mode colors — each mode has a distinct color
+var modeColors = map[permission.Mode]color.Color{
+	permission.ModeBypass:      cGreen,  // green = all allowed
+	permission.ModeDefault:     cBlue,   // blue = prompting
+	permission.ModePlan:        cTeal,   // teal = read-only
+	permission.ModeAcceptEdits: cPurple, // purple = edits ok
+	permission.ModeAuto:        cPeach,  // peach = smart
+	permission.ModeDeny:        cRed,    // red = locked down
+}
+
+// ModeColor returns the color for a permission mode.
+func ModeColor(mode permission.Mode) color.Color {
+	if c, ok := modeColors[mode]; ok {
+		return c
+	}
+	return cOverlay
+}
+
 // Header
 var (
 	sHeaderBrand = lipgloss.NewStyle().
@@ -79,7 +104,4 @@ var (
 
 	sStatusIncognito = lipgloss.NewStyle().
 				Foreground(cYellow)
-
-	sLine = lipgloss.NewStyle().
-		Foreground(cSurface)
 )