feat: centered card-style host list layout

- Each host rendered as a bordered card (HostCardStyle / HostCardActiveStyle)
- Title centered horizontally
- Content constrained to 80 columns max
- Vertical centering padding
- Selected host card gets green border (gbGreen #a9b665)
- Empty state message centered
- Removed old plain-text renderHost/renderSelectedHost functions

pkg/tui/host_list_tab.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
 
 	"git.tukangketik.id/swanadiva/hostkeeper/internal/models"
 )
@@ -105,27 +106,54 @@ func (t *HostListTab) Update(msg tea.Msg) (Tab, tea.Cmd) {
 
 // View renders the host list
 func (t *HostListTab) View() string {
+	availW := t.width
+	if availW < 40 {
+		availW = 80
+	}
+
+	// Constrain content width so cards don't stretch too wide
+	contentW := availW
+	if contentW > 80 {
+		contentW = 80
+	}
+
 	var b strings.Builder
 
-	b.WriteString(AppTitleStyle.Render("HOSTKEEPER - SSH Manager"))
+	// Centered title
+	title := AppTitleStyle.Render(" HOSTKEEPER - SSH Manager ")
+	b.WriteString(lipgloss.Place(contentW, 1, lipgloss.Center, lipgloss.Center, title))
 	b.WriteString("\n\n")
 
 	if len(t.hosts) == 0 {
-		b.WriteString(SubtitleStyle.Render("No hosts found. Add your first host with: hostkeeper add"))
-		b.WriteString("\n\n")
-		return b.String()
-	}
-
-	for i, host := range t.hosts {
-		if i == t.selectedIndex {
-			b.WriteString(renderSelectedHost(host))
-		} else {
-			b.WriteString(renderHost(host))
+		b.WriteString(lipgloss.Place(contentW, 1, lipgloss.Center, lipgloss.Center,
+			SubtitleStyle.Render("No hosts found. Add with Ctrl+N")))
+	} else {
+		cardW := contentW - 4
+		if cardW < 30 {
+			cardW = 30
+		}
+		for i, host := range t.hosts {
+			entry := renderHostEntry(host, i == t.selectedIndex, cardW)
+			b.WriteString(entry)
+			b.WriteString("\n")
 		}
-		b.WriteString("\n")
 	}
 
-	return b.String()
+	// Center horizontally within the full terminal width
+	content := lipgloss.Place(availW, 1, lipgloss.Center, lipgloss.Top, b.String())
+
+	// Add vertical padding to push content toward center of screen
+	availH := t.height - 5
+	if availH < 0 {
+		availH = 0
+	}
+	contentLines := strings.Count(content, "\n") + 1
+	if contentLines < availH {
+		topPad := (availH - contentLines) / 2
+		content = strings.Repeat("\n", topPad) + content
+	}
+
+	return content
 }
 
 // Close is a no-op for host list tab
@@ -159,28 +187,40 @@ func FindHostListTab(tabs []Tab) *HostListTab {
 	return nil
 }
 
-// renderHost renders a single host
-func renderHost(host *models.Host) string {
-	var b strings.Builder
+// renderHostEntry renders a single host as a card
+func renderHostEntry(host *models.Host, selected bool, width int) string {
+	// Build the card content
+	var inner strings.Builder
 
-	b.WriteString(HostNameStyle.Render(host.Name))
-	b.WriteString("\n")
-
-	details := fmt.Sprintf("   %s@%s:%d", host.Username, host.Hostname, host.Port)
-	b.WriteString(HostDetailStyle.Render(details))
+	// First line: host name (bold)
+	name := truncateString(host.Name, width-4)
+	inner.WriteString(HostNameStyle.Render(" " + name))
+	inner.WriteString("\n")
 
+	// Second line: user@host:port with tags
+	addr := fmt.Sprintf("%s@%s:%d", host.Username, host.Hostname, host.Port)
 	if len(host.Tags) > 0 {
-		tags := formatTagsForTUI(host.Tags)
-		b.WriteString(" " + TagStyle.Render(tags))
+		addr += "  " + formatTagsForTUI(host.Tags)
+	}
+	inner.WriteString(HostDetailStyle.Render(" " + truncateString(addr, width-2)))
+
+	cardStyle := HostCardStyle
+	if selected {
+		cardStyle = HostCardActiveStyle
 	}
 
-	return b.String()
+	return cardStyle.Width(width).Render(inner.String())
 }
 
-// renderSelectedHost renders the selected host with highlight
-func renderSelectedHost(host *models.Host) string {
-	hostText := renderHost(host)
-	return SelectedStyle.Render(hostText)
+// truncateString truncates a string to the given max length, appending "…" if needed
+func truncateString(s string, maxLen int) string {
+	if maxLen < 1 {
+		return ""
+	}
+	if len(s) <= maxLen {
+		return s
+	}
+	return s[:maxLen-1] + "…"
 }
 
 // formatTagsForTUI formats tags for TUI display
@@ -188,11 +228,9 @@ func formatTagsForTUI(tags []string) string {
 	if len(tags) == 0 {
 		return ""
 	}
-
 	var formatted []string
 	for _, tag := range tags {
 		formatted = append(formatted, "["+tag+"]")
 	}
-
 	return strings.Join(formatted, " ")
 }