style(watchlist): drop the lone '!' on needed lines

A needed line already says so twice — the amber left border and the Needed!
badge — and the exclamation mark was noise. The green tick stays on worked
lines.

frontend/src/components/WatchlistTab.tsx

@@ -289,7 +289,7 @@ export function WatchlistTab({ spots, spotStatus, onSpotSelect, onSpotClick }: P
                         title={t('wl.spotTip')}
                         className={cn('w-full flex items-center gap-2 px-2 py-1.5 rounded text-[11px] bg-muted/40 hover:bg-muted text-left',
                           !done && 'border-l-2 border-warning')}>
-                        <span className={cn('font-bold shrink-0', done ? 'text-success' : 'text-warning')}>{done ? '✓' : '!'}</span>
+                        {done && <span className='font-bold shrink-0 text-success'>✓</span>}
                         <span className="font-mono font-bold text-info shrink-0">{s.dx_call}</span>
                         <span className="text-muted-foreground truncate flex-1 min-w-0 max-w-56">{(s as any).country ?? ''}</span>
                         <span className="px-1.5 rounded bg-muted shrink-0">{s.band}</span>