feat(tui): stable detail panel height with scroll support

Detail sidebar now maintains consistent height matching the monitors
panel across all modes (default, SLA, history). Content scrolls within
the fixed frame via mouse wheel or j/k when the detail panel is
focused. Scroll offset resets on mode/monitor/period changes. Logs
strip stays visible in all states.

internal/tui/panel.go

@@ -6,16 +6,69 @@ import (
 	"github.com/charmbracelet/lipgloss"
 )
 
-func (m Model) titledPanelH(title, content string, width, height int, focused bool) string {
-	s := m.titledPanel(title, content, width, focused)
+func (m Model) titledPanelH(title, content string, width, height, scrollOffset int, focused bool) string {
 	if height <= 0 {
-		return s
+		return m.titledPanel(title, content, width, focused)
 	}
-	lines := strings.Split(s, "\n")
-	if len(lines) <= height {
-		return s
+
+	borderColor := m.theme.Border
+	titleColor := m.theme.Muted
+	if focused {
+		borderColor = m.theme.Accent
+		titleColor = m.theme.Accent
 	}
-	return strings.Join(lines[:height-1], "\n") + "\n" + lines[len(lines)-1]
+
+	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)+"╮")
+	bottom := bc.Render("╰" + strings.Repeat("─", innerW) + "╯")
+
+	contentStyle := lipgloss.NewStyle().Width(innerW).MaxWidth(innerW)
+	inner := contentStyle.Render(content)
+	contentLines := strings.Split(inner, "\n")
+
+	bodyH := height - 2
+	if bodyH < 1 {
+		bodyH = 1
+	}
+
+	if scrollOffset > len(contentLines)-bodyH {
+		scrollOffset = len(contentLines) - bodyH
+	}
+	if scrollOffset < 0 {
+		scrollOffset = 0
+	}
+
+	end := scrollOffset + bodyH
+	if end > len(contentLines) {
+		end = len(contentLines)
+	}
+	visible := contentLines[scrollOffset:end]
+
+	var lines []string
+	lines = append(lines, top)
+	for _, line := range visible {
+		lines = append(lines, bc.Render("│")+line+strings.Repeat(" ", max(0, innerW-lipgloss.Width(line)))+bc.Render("│"))
+	}
+	for len(lines) < height-1 {
+		lines = append(lines, bc.Render("│")+strings.Repeat(" ", innerW)+bc.Render("│"))
+	}
+	lines = append(lines, bottom)
+
+	return strings.Join(lines, "\n")
 }
 
 func (m Model) titledPanel(title, content string, width int, focused bool) string {

internal/tui/tui.go

@@ -160,11 +160,12 @@ type Model struct {
 	historySiteName string
 	historySiteID   int
 
-	slaReport         monitor.SLAReport
-	slaDailyBreakdown []monitor.DayReport
-	slaSiteName       string
-	slaSiteID         int
-	slaPeriodIdx      int
+	slaReport          monitor.SLAReport
+	slaDailyBreakdown  []monitor.DayReport
+	slaSiteName        string
+	slaSiteID          int
+	slaPeriodIdx       int
+	detailScrollOffset int
 
 	isAdmin bool
 	zones   *zone.Manager

internal/tui/update.go

@@ -298,6 +298,18 @@ func (m *Model) handleMouse(msg tea.MouseMsg) (tea.Model, tea.Cmd) {
 		return m, nil
 	}
 
+	if m.focusedPanel == panelDetail && m.detailOpen {
+		if msg.Button == tea.MouseButtonWheelUp {
+			m.detailScrollOffset -= 3
+		} else {
+			m.detailScrollOffset += 3
+		}
+		if m.detailScrollOffset < 0 {
+			m.detailScrollOffset = 0
+		}
+		return m, nil
+	}
+
 	listLen := m.currentListLen()
 	if msg.Button == tea.MouseButtonWheelUp {
 		if m.cursor > 0 {
@@ -588,6 +600,13 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 		}
 		m.recalcLayout()
 	case "up", "k":
+		if m.focusedPanel == panelDetail && m.detailOpen {
+			m.detailScrollOffset--
+			if m.detailScrollOffset < 0 {
+				m.detailScrollOffset = 0
+			}
+			return m, nil
+		}
 		if m.focusedPanel == panelMaint {
 			m.scrollMaintCursor(-1)
 			return m, nil
@@ -604,10 +623,15 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.syncSelectedID()
 			if m.detailOpen && m.cursor < len(m.sites) {
 				m.detailMode = detailDefault
+				m.detailScrollOffset = 0
 				return m, m.loadDetailCmd(m.sites[m.cursor].ID)
 			}
 		}
 	case "down", "j":
+		if m.focusedPanel == panelDetail && m.detailOpen {
+			m.detailScrollOffset++
+			return m, nil
+		}
 		if m.focusedPanel == panelMaint {
 			m.scrollMaintCursor(1)
 			return m, nil
@@ -625,6 +649,7 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.syncSelectedID()
 			if m.detailOpen && m.cursor < len(m.sites) {
 				m.detailMode = detailDefault
+				m.detailScrollOffset = 0
 				return m, m.loadDetailCmd(m.sites[m.cursor].ID)
 			}
 		}
@@ -652,6 +677,7 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 		if len(m.sites) > 0 {
 			m.detailOpen = !m.detailOpen
 			m.detailMode = detailDefault
+			m.detailScrollOffset = 0
 			m.recalcLayout()
 			st := m.store
 			ctx := m.ctx
@@ -702,9 +728,11 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.focusedPanel = panelMonitors
 		} else if m.detailOpen && m.detailMode != detailDefault {
 			m.detailMode = detailDefault
+			m.detailScrollOffset = 0
 		} else if m.detailOpen {
 			m.detailOpen = false
 			m.detailMode = detailDefault
+			m.detailScrollOffset = 0
 			m.recalcLayout()
 			st := m.store
 			ctx := m.ctx
@@ -719,6 +747,7 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.historySiteID = site.ID
 			m.historyChanges = nil
 			m.detailMode = detailHistory
+			m.detailScrollOffset = 0
 			return m, m.loadHistoryCmd(site.ID)
 		}
 	case "s":
@@ -728,6 +757,7 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.slaSiteID = site.ID
 			m.slaPeriodIdx = 2
 			m.detailMode = detailSLA
+			m.detailScrollOffset = 0
 			return m, m.loadSLACmd(site.ID, m.slaPeriodIdx)
 		}
 	case "1", "2", "3", "4":
@@ -735,6 +765,7 @@ func (m *Model) handleDashboardKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			idx := int(msg.String()[0]-'0') - 1
 			if idx >= 0 && idx < len(slaPeriods) {
 				m.slaPeriodIdx = idx
+				m.detailScrollOffset = 0
 				return m, m.loadSLACmd(m.slaSiteID, idx)
 			}
 		}
@@ -860,6 +891,7 @@ func (m *Model) handleClick(msg tea.MouseMsg) (tea.Model, tea.Cmd) {
 			m.syncSelectedID()
 			m.focusedPanel = panelMonitors
 			if m.detailOpen {
+				m.detailScrollOffset = 0
 				return m, m.loadDetailCmd(m.sites[m.cursor].ID)
 			}
 			return m, nil

internal/tui/view_dashboard.go

@@ -192,7 +192,7 @@ func (m Model) viewMonitorsLayout() string {
 		}
 		monHeight := lipgloss.Height(monPanel)
 		detail := m.viewDetailInline(detailW-2, monHeight)
-		detailPanel := m.zones.Mark("panel-detail", m.titledPanelH(title, detail, detailW, monHeight, m.focusedPanel == panelDetail))
+		detailPanel := m.zones.Mark("panel-detail", m.titledPanelH(title, detail, detailW, monHeight, m.detailScrollOffset, m.focusedPanel == panelDetail))
 		topParts = append(topParts, detailPanel)
 	}
 

internal/tui/view_detail_inline.go

@@ -235,7 +235,7 @@ func (m Model) fmtStatusWord(status string) string {
 	}
 }
 
-func (m Model) viewSLASidebar(width, height int) string {
+func (m Model) viewSLASidebar(width, _ int) string {
 	var b strings.Builder
 	label := m.st.subtleStyle
 	innerW := width - 4
@@ -277,21 +277,7 @@ func (m Model) viewSLASidebar(width, height int) string {
 		if dayBarW < 10 {
 			dayBarW = 10
 		}
-		slaChrome := 14
-		if r.OutageCount > 0 {
-			slaChrome += 3
-		}
-		maxDaily := len(m.slaDailyBreakdown)
-		if height > 0 && height-slaChrome < maxDaily {
-			maxDaily = height - slaChrome
-			if maxDaily < 1 {
-				maxDaily = 1
-			}
-		}
-		for i, day := range m.slaDailyBreakdown {
-			if i >= maxDaily {
-				break
-			}
+		for _, day := range m.slaDailyBreakdown {
 			dateStr := day.Date.Format("Jan 02")
 			dayBar := m.uptimeBar(day.UptimePct, dayBarW)
 			pctStr := fmtPct(day.UptimePct) + "%"