fix(tui): set explicit NAME column width to match content truncation

Was width=0 (auto) which let lipgloss over-allocate the column,
causing visible empty space between truncated names and TYPE column.
Now set to nameW explicitly so column width = truncation limit.

internal/tui/tab_sites.go

@@ -412,7 +412,7 @@ func (m Model) computeLayout() tableLayout {
 	for i, c := range cols {
 		if i == 1 {
 			headers[i] = "NAME"
-			widths[i] = 0
+			widths[i] = nameW
 			continue
 		}
 		if i == 6 {