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

JOURNAL.md

@@ -0,0 +1,44 @@
+# Cosmic Garden - Development Journal
+
+This file tracks all development progress for the Cosmic Garden idle game.
+
+## Session Log
+
+### 2026-08-19 - Statistics Panel Feature
+
+**What was worked on:**
+- Recreated the full game foundation (workspace was cleared between sessions)
+- Added a new Statistics tab to the side panel
+- Fixed global production bonus calculation bug in game.js
+
+**New Feature Details:**
+The Statistics panel provides comprehensive game metrics:
+- Total Stardust Earned
+- Current Production Rate (✨/sec)
+- Total Clicks
+- Click Power
+- Time Played (auto-formatted as HH:MM:SS)
+- Buildings Owned count
+- Upgrades Purchased (with total available)
+- Achievements Unlocked (with total available)
+- Game Progress bar (percentage based on stardust milestones)
+
+**Files Changed:**
+- `index.html` - Added Stats tab UI
+- `js/stats.js` - New statistics tracking module
+- `js/game.js` - Fixed global bonus calculation
+- `css/game.css` - Added stats panel styling
+
+**Testing:**
+- Verified stats update correctly during gameplay
+- Confirmed time formatting works properly
+- Checked progress bar calculation
+
+**Next Session Goals:**
+- Add particle effects on click
+- Implement mobile touch optimizations
+- Consider adding prestige system
+
+---
+
+*Last updated: 2026-08-19*