fix(tui): maint tab — MONITORS is flex, dates get room, time adapts to width

TITLE was flex eating all space while dates/monitors squeezed. Flipped:
MONITORS is now flex, TITLE fixed (12-24), dates min 14, STATUS min 11.
fmtMaintTime uses compact format (Jan 02) at narrow widths.

internal/tui/tab_maint.go

@@ -57,7 +57,7 @@ func fmtMaintMonitorW(monitorID int, sites []models.Site, maxW int) string {
 	return fmt.Sprintf("#%d", monitorID)
 }
 
-func fmtMaintTime(t time.Time) string {
+func fmtMaintTime(t time.Time, colW int) string {
 	if t.IsZero() {
 		return subtleStyle.Render("—")
 	}
@@ -65,8 +65,11 @@ func fmtMaintTime(t time.Time) string {
 	if t.Year() == now.Year() && t.YearDay() == now.YearDay() {
 		return t.Format("15:04")
 	}
+	if colW >= 14 {
 		return t.Format("15:04 Jan 02")
 	}
+	return t.Format("Jan 02")
+}
 
 func (m Model) isMonitorInMaintenance(monitorID int) bool {
 	for _, mw := range m.maintenanceWindows {
@@ -99,16 +102,17 @@ func (m Model) viewMaintTab() string {
 
 	cols := []colDef{
 		{"#", "#", 4, 4, false},
-		{"TITLE", "TITLE", 10, 28, true},
+		{"TITLE", "TITLE", 12, 24, false},
 		{"TYPE", "TYPE", 13, 14, false},
-		{"MON", "MONITORS", 10, 22, false},
+		{"MON", "MONITORS", 14, 22, true},
-		{"ST", "STATUS", 8, 12, false},
+		{"ST", "STATUS", 11, 12, false},
-		{"START", "STARTED", 8, 16, false},
+		{"START", "STARTED", 14, 16, false},
-		{"ENDS", "ENDS", 8, 16, false},
+		{"ENDS", "ENDS", 14, 16, false},
 	}
 	headers, widths := m.computeTableLayout(cols, 0)
 	titleW := widths[1]
 	monW := widths[3]
+	timeW := widths[5]
 
 	return m.renderTable(
 		headers,
@@ -124,8 +128,8 @@ func (m Model) viewMaintTab() string {
 					fmtMaintType(mw.Type),
 					fmtMaintMonitorW(mw.MonitorID, allSites, monW-2),
 					fmtMaintStatus(mw),
-					fmtMaintTime(mw.StartTime),
+					fmtMaintTime(mw.StartTime, timeW),
-					fmtMaintTime(mw.EndTime),
+					fmtMaintTime(mw.EndTime, timeW),
 				})
 			}
 			return rows