feat: replace clipboard copy with config display for SSH sessions

Created ConfigDisplay component that shows full client configuration
in a scrollable modal window, replacing non-functional clipboard copy.

Benefits:
- Works over SSH sessions (no clipboard API needed)
- Shows complete configuration, not just public key
- Scrollable for long configs with keyboard navigation
- Users can select and copy text directly in terminal

Changes:
- Created internal/tui/components/config-display.go
- Updated detail.go to replace copyPublicKey with loadConfig
- Removed clipboard-related fields and message type
- Updated help text: 'c' now shows config
- Key bindings for scrolling: ↑↓, pgup/pgdn, g/G, Esc/q to close

Fixes: wg-admin-qtb

internal/tui/screens/detail.go

@@ -12,15 +12,15 @@ import (
 
 // DetailScreen displays detailed information about a single WireGuard client
 type DetailScreen struct {
-	client          wireguard.Client
-	status          string
-	lastHandshake   time.Time
-	transferRx      string
-	transferTx      string
-	confirmModal    *components.DeleteConfirmModel
-	showConfirm     bool
-	clipboardCopied bool
-	clipboardTimer  int
+	client        wireguard.Client
+	status        string
+	lastHandshake time.Time
+	transferRx    string
+	transferTx    string
+	confirmModal  *components.DeleteConfirmModel
+	showConfirm   bool
+	configDisplay *components.ConfigDisplayModel
+	showConfig    bool
 }
 
 // Styles
@@ -71,15 +71,6 @@ func (s *DetailScreen) Init() tea.Cmd {
 func (s *DetailScreen) Update(msg tea.Msg) (Screen, tea.Cmd) {
 	var cmd tea.Cmd
 
-	// Handle clipboard copy timeout
-	if s.clipboardCopied {
-		s.clipboardTimer++
-		if s.clipboardTimer > 2 {
-			s.clipboardCopied = false
-			s.clipboardTimer = 0
-		}
-	}
-
 	// Handle confirmation modal
 	if s.showConfirm && s.confirmModal != nil {
 		_, cmd = s.confirmModal.Update(msg)
@@ -100,10 +91,21 @@ func (s *DetailScreen) Update(msg tea.Msg) (Screen, tea.Cmd) {
 		return s, cmd
 	}
 
+	// Handle config display modal
+	if s.showConfig && s.configDisplay != nil {
+		_, cmd = s.configDisplay.Update(msg)
+
+		// Handle modal close
+		if !s.configDisplay.IsVisible() {
+			s.showConfig = false
+			return s, nil
+		}
+
+		return s, cmd
+	}
+
 	// Handle normal screen messages
 	switch msg := msg.(type) {
-	case clipboardCopiedMsg:
-		s.clipboardCopied = true
 	case clientStatusLoadedMsg:
 		s.status = msg.status
 		s.lastHandshake = msg.lastHandshake
@@ -123,8 +125,8 @@ func (s *DetailScreen) Update(msg tea.Msg) (Screen, tea.Cmd) {
 			)
 			s.showConfirm = true
 		case "c":
-			// Copy public key to clipboard
-			return s, s.copyPublicKey()
+			// Show client configuration
+			return s, s.loadConfig()
 		}
 	}
 
@@ -133,6 +135,12 @@ func (s *DetailScreen) Update(msg tea.Msg) (Screen, tea.Cmd) {
 
 // View renders the detail screen
 func (s *DetailScreen) View() string {
+	// Handle config display modal
+	if s.showConfig && s.configDisplay != nil {
+		return s.configDisplay.View()
+	}
+
+	// Handle confirmation modal
 	if s.showConfirm && s.confirmModal != nil {
 		// Render underlying content dimmed
 		content := s.renderContent()
@@ -186,14 +194,9 @@ func (s *DetailScreen) renderContent() string {
 	)
 
 	// Add help text
-	helpText := detailHelpStyle.Render("Actions: [d] Delete • [c] Copy Public Key • [b] Back")
+	helpText := detailHelpStyle.Render("Actions: [d] Delete • [c] View Config • [b] Back")
 	content = lipgloss.JoinVertical(lipgloss.Left, content, helpText)
 
-	// Show clipboard confirmation
-	if s.clipboardCopied {
-		content += "\n" + lipgloss.NewStyle().Foreground(lipgloss.Color("46")).Render("✓ Public key copied to clipboard!")
-	}
-
 	return content
 }
 
@@ -252,13 +255,22 @@ func (s *DetailScreen) loadClientStatus() tea.Msg {
 	}
 }
 
-// copyPublicKey copies the public key to clipboard
-func (s *DetailScreen) copyPublicKey() tea.Cmd {
+// loadConfig loads and displays the client configuration
+func (s *DetailScreen) loadConfig() tea.Cmd {
 	return func() tea.Msg {
-		// Note: In a real implementation, you would use a clipboard library like
-		// github.com/atotto/clipboard or implement platform-specific clipboard access
-		// For now, we'll just simulate the action
-		return clipboardCopiedMsg{}
+		config, err := wireguard.GetClientConfigContent(s.client.Name)
+		if err != nil {
+			return errMsg{fmt.Errorf("failed to load client config: %w", err)}
+		}
+
+		// Create or update config display modal
+		if s.configDisplay == nil {
+			s.configDisplay = components.NewConfigDisplay(config, 80, 24)
+		} else {
+			s.configDisplay.Show(config)
+		}
+		s.showConfig = true
+		return nil
 	}
 }
 
@@ -284,6 +296,3 @@ type clientStatusLoadedMsg struct {
 	transferRx    string
 	transferTx    string
 }
-
-// clipboardCopiedMsg is sent when public key is copied to clipboard
-type clipboardCopiedMsg struct{}