feat: personal stats page, main menu redesign, quest polish

[uhmin99]

Summary

• Personal stats page ("Your Journey") — treasure counter button top-left opens page showing treasures found, personal bests (high score, combo, all-clears, levels beaten), and lifetime stats (blocks placed, combos, quest stages, packs)
• Main menu redesign — letter-block logo (B/L/O/C/K each in a colored block), 8 floating decorative background blocks, feedback button → GitHub issues, stat tracking wired through classic + quest controllers
• Quest map — 3 nodes per row (was 4), 130px row height, emoji scenery decorations (🌴 ⭐ 🪨 🌺 🗺️ 💰 🌊 🦜 ✨ 🔮), treasure chest animates whether open or closed
• Quest screen — faster goal popup (1.1 s visible, was 2 s), specific targets (exact score/gems), milestone banners bounce with elasticOut + 1 s dismiss (was 1.8 s)
• Quest result — confetti layer (pure Dart, no package), trophy bounce, 3-star fade-in on win; dark green gradient for win state

Test plan

• Treasure counter shows correct count; tapping opens personal stats page
• Personal stats grid shows correct values (high score, combo, all-clears, blocks placed, etc.)
• Main menu logo blocks render; floating bg blocks animate; feedback link opens GitHub issues in browser
• Quest map: 3-per-row layout, emoji decorations visible, chest animates on map
• Stage-start popup dismisses ~1.1 s, shows exact score target or gem count/color
• Milestone banners at 30/50/80% bounce in and fade quickly
• Win screen: confetti rains, trophy bounces, stars appear
• Retry on loss screen works; Continue returns to map and marks level complete
• 94 tests pass, analyze clean, goldens match

🤖 Generated with Claude Code