Habit tracker with useful motivation

Create a mobile-first habit tracker for [AUDIENCE] who want to [GOAL]. The experience should encourage consistency without punishing missed days.

Core experience:
- Today view with habits grouped by morning, afternoon, and evening.
- One-tap completion with an undo option and subtle, reduced-motion-safe feedback.
- Add/edit habit flow: name, icon, frequency, preferred time, reminder, and personal motivation.
- Progress view showing weekly completion, a calendar history, and a gentle consistency trend.
- Reflection prompt after a missed habit: skip, reschedule, reduce the target, or add a note.
- Settings for week start, theme, reduced motion, reminders, and data export.

Use realistic sample habits for [AUDIENCE]. Persist changes locally so the prototype behaves like a real product. Include first-use onboarding, an empty state, confirmation before destructive actions, and a recovery path for errors.

Visual direction: [VISUAL DIRECTION]. Keep the most common action reachable with one thumb. Use celebration sparingly; do not use shame-based language, broken-streak warnings, or excessive gamification.

Validate all completion counts and weekly percentages. Make every interactive control keyboard accessible and clearly labeled.