fix(tui): account for cell padding in NAME column content limits

Group icons, tree prefixes (├/└), and regular names all need 2 extra
chars margin for cell padding. Reduces truncation limits by 2 across
all name rendering paths.

internal/tui/tab_sites.go

@@ -438,7 +438,7 @@ func (m Model) viewSitesTab() string {
 					icon := typeIcon("group", m.collapsed[site.ID])
 					rows = append(rows, []string{
 						strconv.Itoa(i + 1),
-						m.zones.Mark(fmt.Sprintf("site-%d", i), icon+" "+limitStr(site.Name, nameW-2)),
+						m.zones.Mark(fmt.Sprintf("site-%d", i), icon+" "+limitStr(site.Name, nameW-4)),
 						"group",
 						fmtStatus(site.Status, site.Paused, m.isMonitorInMaintenance(site.ID)),
 						subtleStyle.Render("—"),
@@ -456,14 +456,14 @@ func (m Model) viewSitesTab() string {
 					if i+1 >= len(m.sites) || m.sites[i+1].ParentID != site.ParentID {
 						prefix = "└"
 					}
-					name = prefix + " " + limitStr(name, nameW-2)
+					name = prefix + " " + limitStr(name, nameW-4)
 				} else {
-					name = limitStr(name, nameW)
+					name = limitStr(name, nameW-2)
 				}
 
 				if (site.Status == "DOWN" || site.Status == "SSL EXP" || site.Status == "LATE") && site.LastError != "" {
 					nameLen := len([]rune(name))
-					errSpace := nameW - nameLen - 1
+					errSpace := nameW - nameLen - 3
 					if errSpace > 10 {
 						name = name + " " + subtleStyle.Render(limitStr(site.LastError, errSpace))
 					}