Helpers for toasts, titles, appearance and haptics.

• Appearance Apply a saved accent, theme, font and corners to <html>.
• Haptics A short vibration on tap, success or error.
• Page title One page title for the app bar, the header and the tab.
• Password The password rules and strength score, for the form and the server alike.
• Toast Narrate a form action through one promise toast.
• Utils cn to merge Tailwind classes, and the prop helper types.