Update OpenAI API key and enhance app functionality: Replace the OpenAI API key in the .env file for improved access. Refactor app.py to include error handling for missing API keys and implement dark mode functionality with session management. Update README.md to reflect the use of Tailwind CSS via CDN and document the Content Security Policy (CSP) adjustments. Enhance mindmap data loading with a new API endpoint for refreshing data, ensuring better user experience during database connection issues. Update styles and templates for improved UI consistency and responsiveness.

static/js/alpine.min.js

@@ -0,0 +1,12 @@
+/*
+ * Alpine.js v3.12.3
+ * 
+ * This is a placeholder file. For production, you should:
+ * 1. Download the official Alpine.js file from https://github.com/alpinejs/alpine/releases
+ * 2. Replace this file with the downloaded version
+ *
+ * Alternatively, you can run:
+ * curl -L https://cdn.jsdelivr.net/npm/alpinejs@3.12.3/dist/cdn.min.js > alpine.min.js
+ */
+
+console.error('This is a placeholder for Alpine.js. Please replace with the actual library file.');