v1.20.0

• Added date navigation (native date picker, Yesterday tab) with fixed-date sentinel fix.
• Added top-referrers 'Toon meer' toggle (shows 10, reveals up to 50).
• Added dashboard widget (online now, today's views/visitors with % vs yesterday), reusing overview card styling.
• Added review-nudge snooze (random 30-90 days, max 3x then permanent).
• Added device-class label (Phone/Tablet/Desktop) at screen resolution.
• Fixed 90-day chart overflow (gap + horizontal scroll).
• Dutch translations for new strings.