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

dev-journal.md

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+# Dev Journal - Cosmic Garden
+
+## 2026-08-19 - Statistics Panel Added
+
+### What was done:
+- Recreated the full Cosmic Garden game foundation (workspace was cleared between sessions)
+- Added a new **Statistics tab** to the side panel with detailed game metrics
+- Fixed global production bonus calculation in `game.js`
+
+### New Feature: Statistics Panel
+The stats panel tracks and displays:
+- Total Stardust Earned
+- Current Production Rate (✨/sec)
+- Total Clicks
+- Click Power
+- Time Played (formatted as HH:MM:SS)
+- Buildings Owned
+- Upgrades Purchased (with total count)
+- Achievements Unlocked (with total count)
+- Game Progress bar (percentage based on total stardust milestones)
+
+### Files Modified/Created:
+- `index.html` - Added Stats tab button and content area
+- `js/stats.js` - New file for statistics tracking and rendering
+- `js/game.js` - Fixed global bonus calculation in `getProductionPerSecond()`
+- `css/game.css` - Added styles for stats panel elements
+
+### Next Up:
+- Visual effects (particle effects on click)
+- Mobile touch optimizations
+- Prestige/reset system