Mark incomplete features as under construction and implement v0.0.2 release

- Mark incomplete statistics charts with construction notices
- Disable non-functional 3D radar controls
- Implement collapsible Display Options menu (defaults to collapsed)
- Add toast notifications for better error feedback
- Update version to 0.0.2 across all files and packages
- Improve Debian packaging with root-owner-group flag
- Update repository URLs to Forgejo instance
- Create comprehensive feature status documentation
- Created 10 detailed issues for all incomplete features (#5-#14)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

assets/static/js/modules/ui-manager.js

@@ -316,6 +316,22 @@ export class UIManager {
 
     showError(message) {
         console.error(message);
-        // Could implement toast notifications here
+        
+        // Simple toast notification implementation
+        const toast = document.createElement('div');
+        toast.className = 'toast-notification error';
+        toast.textContent = message;
+        
+        // Add to page
+        document.body.appendChild(toast);
+        
+        // Show toast with animation
+        setTimeout(() => toast.classList.add('show'), 100);
+        
+        // Auto-remove after 5 seconds
+        setTimeout(() => {
+            toast.classList.remove('show');
+            setTimeout(() => document.body.removeChild(toast), 300);
+        }, 5000);
     }
 }