feat(tui): lazygit-style titled panel borders

All panels wrapped in titled rounded borders (╭─ Title ──╮). Focused
panel gets accent-colored border, unfocused panels get muted border.

- Monitors panel: titled "Monitors", focused when detail is closed
- Logs panel: titled "Logs", always unfocused (passive display)
- Detail panel: titled with monitor name, focused when open

Table's own RoundedBorder replaced with HiddenBorder — the titled
panel border provides the visual frame, table uses space-separated
columns internally. Consistent chrome across all panels.

internal/tui/panel.go

@@ -0,0 +1,52 @@
+package tui
+
+import (
+	"strings"
+
+	"github.com/charmbracelet/lipgloss"
+)
+
+func (m Model) titledPanel(title, content string, width int, focused bool) string {
+	borderColor := m.theme.Border
+	titleColor := m.theme.Muted
+	if focused {
+		borderColor = m.theme.Accent
+		titleColor = m.theme.Accent
+	}
+
+	bc := lipgloss.NewStyle().Foreground(borderColor)
+	tc := lipgloss.NewStyle().Foreground(titleColor).Bold(true)
+
+	innerW := width - 2
+	if innerW < 10 {
+		innerW = 10
+	}
+
+	titleRendered := tc.Render(" " + title + " ")
+	titleLen := len([]rune(title)) + 2
+	fillLen := innerW - titleLen - 1
+	if fillLen < 0 {
+		fillLen = 0
+	}
+
+	top := bc.Render("╭─") + titleRendered + bc.Render(strings.Repeat("─", fillLen)+"╮")
+
+	contentStyle := lipgloss.NewStyle().Width(innerW).MaxWidth(innerW)
+	inner := contentStyle.Render(content)
+
+	var lines []string
+	lines = append(lines, top)
+	for _, line := range strings.Split(inner, "\n") {
+		lines = append(lines, bc.Render("│")+line+strings.Repeat(" ", max(0, innerW-lipgloss.Width(line)))+bc.Render("│"))
+	}
+	lines = append(lines, bc.Render("╰"+strings.Repeat("─", innerW)+"╯"))
+
+	return strings.Join(lines, "\n")
+}
+
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}

internal/tui/table_helpers.go

@@ -52,8 +52,7 @@ func (m Model) renderTable(headers []string, items int, buildRows func(start, en
 	}
 
 	t := table.New().
-		Border(lipgloss.RoundedBorder()).
-		BorderStyle(m.st.tableBorderStyle).
+		Border(lipgloss.HiddenBorder()).
 		Width(tableWidth).
 		Headers(headers...).
 		Rows(rows...).
@@ -94,5 +93,5 @@ func (m Model) renderTable(headers []string, items int, buildRows func(start, en
 			return base
 		})
 
-	return "\n" + t.Render()
+	return t.Render()
 }

internal/tui/view_dashboard.go

@@ -157,35 +157,38 @@ func (m Model) viewDashboard() string {
 			availW := m.termWidth - chromePadH
 			leftW := availW * 70 / 100
 			rightW := availW - leftW
-			m.contentWidth = leftW
+			m.contentWidth = leftW - 2
 			monitors := m.viewSitesTab()
-			left := lipgloss.NewStyle().Width(leftW).Render(monitors)
-			sidebarBorder := lipgloss.NewStyle().
-				Border(lipgloss.RoundedBorder()).
-				BorderForeground(m.theme.Border).
-				BorderLeft(false).
-				BorderBottom(false)
-			innerW := rightW - 2
-			if innerW < 10 {
-				innerW = 10
-			}
-			sidebar := m.viewLogsSidebar(innerW, m.maxTableRows)
-			right := sidebarBorder.Render(sidebar)
-			top := lipgloss.JoinHorizontal(lipgloss.Top, left, right)
+			monPanel := m.titledPanel("Monitors", monitors, leftW, !m.detailOpen)
+			sidebarContent := m.viewLogsSidebar(rightW-2, m.maxTableRows)
+			logPanel := m.titledPanel("Logs", sidebarContent, rightW, false)
+			top := lipgloss.JoinHorizontal(lipgloss.Top, monPanel, logPanel)
 			if m.detailOpen {
-				detail := m.viewDetailInline(availW)
-				content = top + "\n" + detail
+				site := ""
+				if m.cursor < len(m.sites) {
+					site = m.sites[m.cursor].Name
+				}
+				detail := m.viewDetailInline(availW - 2)
+				detailPanel := m.titledPanel(site, detail, availW, true)
+				content = top + "\n" + detailPanel
 			} else {
 				content = top
 			}
 		} else {
-			m.contentWidth = m.termWidth
+			m.contentWidth = m.termWidth - 2
 			monitors := m.viewSitesTab()
+			availW := m.termWidth - chromePadH
+			monPanel := m.titledPanel("Monitors", monitors, availW, !m.detailOpen)
 			if m.detailOpen {
-				detail := m.viewDetailInline(m.termWidth - chromePadH)
-				content = monitors + "\n" + detail
+				site := ""
+				if m.cursor < len(m.sites) {
+					site = m.sites[m.cursor].Name
+				}
+				detail := m.viewDetailInline(availW - 2)
+				detailPanel := m.titledPanel(site, detail, availW, true)
+				content = monPanel + "\n" + detailPanel
 			} else {
-				content = monitors
+				content = monPanel
 			}
 		}
 	case tabMaint:

internal/tui/view_detail_inline.go

@@ -18,15 +18,6 @@ func (m Model) viewDetailInline(width int) string {
 
 	var b strings.Builder
 
-	title := m.st.titleStyle.Render(site.Name)
-	b.WriteString("  " + title + "\n")
-
-	divW := width - 4
-	if divW < 20 {
-		divW = 20
-	}
-	b.WriteString("  " + m.st.subtleStyle.Render(strings.Repeat("─", divW)) + "\n")
-
 	status := m.fmtStatus(site.Status, site.Paused, m.isMonitorInMaintenance(site.ID))
 	latency := m.fmtLatency(site.Latency)
 	uptime := m.fmtUptime(hist.Statuses)