refactor(tui): replace # column with colored status dot

Drop the row-number column and add a colored status dot as the first
column. Dot uses the same icon/color as the existing status indicators
(▲ green for up, ▼ red for down, ◼ purple for maint, etc). Matches
the maint strip visual pattern. Status text column retained for
explicit label.

internal/tui/format.go

@@ -162,6 +162,27 @@ func (m Model) fmtRetries(site models.Site) string {
 	return s
 }
 
+func (m Model) fmtStatusDot(status models.Status, paused bool, inMaint bool) string {
+	if paused {
+		return m.st.warnStyle.Render("◇")
+	}
+	if inMaint {
+		return m.st.maintStyle.Render("◼")
+	}
+	switch status {
+	case models.StatusDown, models.StatusSSLExp:
+		return m.st.dangerStyle.Render("▼")
+	case models.StatusLate:
+		return m.st.warnStyle.Render("◆")
+	case models.StatusStale:
+		return m.st.staleStyle.Render("◆")
+	case models.StatusPending:
+		return m.st.subtleStyle.Render("○")
+	default:
+		return m.st.specialStyle.Render("▲")
+	}
+}
+
 func (m Model) fmtStatus(status models.Status, paused bool, inMaint bool) string {
 	if paused {
 		return m.st.warnStyle.Render("◇ PAUSED")

internal/tui/tab_sites.go

@@ -34,7 +34,7 @@ type siteFormData struct {
 type colKey int
 
 const (
-	colNum colKey = iota
+	colDot colKey = iota
 	colName
 	colType
 	colStatus
@@ -55,7 +55,7 @@ type columnDef struct {
 }
 
 var siteColumns = []columnDef{
-	{colNum, "#", "#", 4, 4, 0},
+	{colDot, "", "", 3, 3, 0},
 	{colName, "NAME", "NAME", 0, 0, 0},
 	{colType, "TYPE", "TYPE", 10, 8, mediumBreakpoint},
 	{colStatus, "STATUS", "STATUS", 10, 10, 0},
@@ -245,11 +245,12 @@ func (m Model) viewSitesTab() string {
 				if site.Type == "group" {
 					groupRows[i-start] = true
 					icon := typeIcon("group", m.collapsed[site.ID])
+					inMaint := m.isMonitorInMaintenance(site.ID)
 					cells := map[colKey]string{
-						colNum:     strconv.Itoa(i + 1),
+						colDot:     m.fmtStatusDot(site.Status, site.Paused, inMaint),
 						colName:    m.zones.Mark(fmt.Sprintf("site-%d", i), icon+" "+limitStr(site.Name, nameW-4)),
 						colType:    "group",
-						colStatus:  m.fmtStatus(site.Status, site.Paused, m.isMonitorInMaintenance(site.ID)),
+						colStatus:  m.fmtStatus(site.Status, site.Paused, inMaint),
 						colLatency: m.st.subtleStyle.Render("—"),
 						colUptime:  m.groupUptime(site.ID),
 						colHistory: m.groupSparkline(site.ID, sparkWidth, rowBg),
@@ -293,11 +294,12 @@ func (m Model) viewSitesTab() string {
 					spark = m.latencySparkline(hist.Latencies, hist.Statuses, sparkWidth, rowBg)
 				}
 
+				inMaint := m.isMonitorInMaintenance(site.ID)
 				cells := map[colKey]string{
-					colNum:     strconv.Itoa(i + 1),
+					colDot:     m.fmtStatusDot(site.Status, site.Paused, inMaint),
 					colName:    m.zones.Mark(fmt.Sprintf("site-%d", i), name),
 					colType:    typeIcon(site.Type, false) + " " + site.Type,
-					colStatus:  m.fmtStatus(site.Status, site.Paused, m.isMonitorInMaintenance(site.ID)),
+					colStatus:  m.fmtStatus(site.Status, site.Paused, inMaint),
 					colLatency: m.fmtLatency(site.Latency),
 					colUptime:  m.fmtUptimeMaint(hist.Statuses, site.ID),
 					colHistory: spark,