fix(tui): show — for uptime when monitor is in maintenance

Monitors in active maintenance now display — instead of a misleading
0.0% uptime in both the main table and detail sidebar.

internal/tui/format.go

@@ -104,6 +104,13 @@ func (m Model) fmtLatency(d time.Duration) string {
 	return m.st.dangerStyle.Render(s)
 }
 
+func (m Model) fmtUptimeMaint(statuses []bool, siteID int) string {
+	if m.isMonitorInMaintenance(siteID) {
+		return m.st.subtleStyle.Render("—")
+	}
+	return m.fmtUptime(statuses)
+}
+
 func (m Model) fmtUptime(statuses []bool) string {
 	if len(statuses) == 0 {
 		return m.st.subtleStyle.Render("—")

internal/tui/tab_sites.go

@@ -299,7 +299,7 @@ func (m Model) viewSitesTab() string {
 					colType:    typeIcon(site.Type, false) + " " + site.Type,
 					colStatus:  m.fmtStatus(site.Status, site.Paused, m.isMonitorInMaintenance(site.ID)),
 					colLatency: m.fmtLatency(site.Latency),
-					colUptime:  m.fmtUptime(hist.Statuses),
+					colUptime:  m.fmtUptimeMaint(hist.Statuses, site.ID),
 					colHistory: spark,
 					colSSL:     m.fmtSSL(site),
 					colRetries: m.fmtRetries(site),

internal/tui/view_detail_inline.go

@@ -53,7 +53,11 @@ func (m Model) viewDetailSidebar(site models.Site, hist monitor.SiteHistory, wid
 	}
 
 	// Uptime + retries
-	uptimeParts := []string{label.Render("Uptime") + " " + m.fmtUptime(hist.Statuses)}
+	uptimeStr := m.fmtUptime(hist.Statuses)
+	if m.isMonitorInMaintenance(site.ID) {
+		uptimeStr = m.st.subtleStyle.Render("—")
+	}
+	uptimeParts := []string{label.Render("Uptime") + " " + uptimeStr}
 	if site.Type != "group" && site.MaxRetries > 0 {
 		uptimeParts = append(uptimeParts, label.Render("Retries")+" "+m.fmtRetries(site))
 	}