Dotto v0.1.2

Added

• Manual theme switching: cycle between System / Light / Dark via top bar icon
• Widget one-tap check-in: tap the check mark on any habit row to toggle directly from widget
• Notification quick check-in: "Check in ✓" action button on reminder notifications
• Confetti animation on check-in (6-particle burst with spring physics)
• Optional check-in comment (50 chars max): inline note field on home screen, long-press calendar date to edit in detail screen
• Comment indicator dots on calendar dates that have notes
• Data export/import (JSON via SAF): backup and restore all habits and check-in history
• Database migration v2→v3 for check-in comment field

Changed

• Color picker selected border: adaptive color instead of hard black (darkened for light colors, white for dark colors)
• Version bumped to 0.1.2 (versionCode=6)