Add Statistics Panel feature

- Recreated full game foundation from previous session
- Added Statistics tab with detailed game metrics:
  * Total Stardust Earned
  * Current Production Rate (✨/sec)
  * Total Clicks
  * Click Power
  * Time Played (auto-formatted)
  * Buildings Owned
  * Upgrades Purchased
  * Achievements Unlocked
  * Game Progress bar
- Fixed global production bonus calculation in game.js
- Added responsive CSS for stats panel

Files added: js/stats.js, dev-journal.md, README.md, JOURNAL.md

README.md

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+# Cosmic Garden 🌌🌱
+
+A space gardening idle game built with vanilla HTML, CSS, and JavaScript.
+
+## How to Play
+
+1. Open `index.html` in your browser
+2. Click the "Collect Stardust" button to earn stardust
+3. Buy plants to auto-generate stardust
+4. Purchase upgrades to boost production
+5. Unlock achievements as you progress
+
+## Features
+
+- **12 Unique Plants** across 4 tiers (Star Sprout → Void Fern)
+- **15+ Upgrades** with requirements and bonuses
+- **20 Achievements** to unlock
+- **Core Mechanics**: Click harvesting, auto-production, cost scaling (1.15x per level)
+- **Save System**: Auto-save every 30s, offline progress (50% efficiency), export/import
+- **Statistics Panel**: Track your progress with detailed metrics
+- **UI**: Dark cosmic theme with purple/gold accents, responsive layout, animations
+
+## Development
+
+This project is being developed incrementally. Check `dev-journal.md` for the latest updates.
+
+### Current Version
+- Statistics panel added (2026-08-19)
+
+### Planned Features
+- Visual effects (particle effects on click)
+- Mobile touch optimizations
+- Prestige/reset system
+- Sound effects and music
+- Save game slot system
+
+## License
+
+Private project - owned by lullu