SnapJig

New Features: - Pause & resume games anytime - Auto-merge: pieces with correct relative positions snap together and move as a group - Pinch-to-zoom on the puzzle board (tray stays fixed) - 12 curated images per page across 5 themes (landscape, animals, geography, plants, cartoon) with page refresh - Difficulty picker before starting any puzzle (4×4 to 12×12 with age recommendations) - Unfinished puzzles shown first on home screen as reminders - Replay completed puzzles from history with custom difficulty - Long-press to delete individual history records - Puzzle piece overlay effect on recommended images - Played images excluded from future recommendations Fixes: - Images saved to Documents directory, no longer lost when iOS clears cache - Game saves survive app updates and reinstalls - Pieces can no longer get stuck between board and tray - Game progress properly saved when pressing back - Incomplete records auto-removed after puzzle completion - Removed opacity slider and 3×3 difficulty