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

js/main.js

@@ -0,0 +1,14 @@
+/**
+ * Cosmic Garden - Main Entry Point
+ */
+
+document.addEventListener('DOMContentLoaded', () => {
+    Game.init();
+    
+    // Show last save time
+    const lastSave = SaveSystem.getLastSaveTime();
+    if (lastSave) {
+        document.getElementById('last-saved').textContent = 
+            `Last saved: ${lastSave.toLocaleTimeString()}`;
+    }
+});