Add Spotify integration with improved token management and user interface

- Implemented Spotify OAuth handling in spotify_client_manager.py to ensure valid access tokens for users.
- Created helper functions in spotify_helper.py for refreshing tokens and retrieving user information.
- Developed manage_spotify.html template for connecting and managing Spotify accounts, displaying connection status and token information.
- Added logging for token management processes to enhance debugging and monitoring.
- Introduced a debug client for Spotify interactions to facilitate easier testing and development.

musicround/templates/users/register.html

@@ -6,16 +6,6 @@
 <div class="max-w-md mx-auto my-8 p-6 bg-white rounded-lg shadow-md">
     <h2 class="text-2xl font-bold mb-6 text-navy-800">Create an Account</h2>
     
-    {% with messages = get_flashed_messages(with_categories=true) %}
-        {% if messages %}
-            {% for category, message in messages %}
-                <div class="mb-4 p-3 {% if category == 'danger' %}bg-red-100 text-red-700{% elif category == 'success' %}bg-green-100 text-green-700{% else %}bg-blue-100 text-blue-700{% endif %} rounded">
-                    {{ message }}
-                </div>
-            {% endfor %}
-        {% endif %}
-    {% endwith %}
-    
     <form method="POST" action="{{ url_for('users.register') }}">
         <input type="hidden" name="csrf_token" value="{{ csrf_token() }}"/>