feat(tui-go): welcome "recent" list uses the local date, matching the session list

Was the UTC-then-local time-of-day; now the same "Jan 02 15:04" / "Jan 02 2006"
shortDateTime as the session list, so a previous-day session isn't shown as if
it were today.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/tui-go/internal/app/view.go

@@ -516,7 +516,7 @@ func (m Model) welcomeRows(w int) []string {
 		}
 		for _, s := range m.sessions[start:] {
 			mark := statusGlyph(t, s.Status)
-			rows = append(rows, t.span("  "+s.Name+"  ", t.P.Fg)+t.span(formatTime(s.LastEventAt), t.P.Faint)+" "+mark)
+			rows = append(rows, t.span("  "+s.Name+"  ", t.P.Fg)+t.span(shortDateTime(s.LastEventAt), t.P.Faint)+" "+mark)
 		}
 	}
 	return rows