feat: Refactor template handling, improve scheduler functions, and add timezone utilities

- Moved Jinja2 template setup to a shared configuration file (templates_config.py) for consistent usage across routers.
- Introduced timezone utilities in a new module (timezone.py) to handle UTC to local time conversions and formatting.
- Updated all relevant routers to use the new shared template configuration and timezone filters.
- Enhanced templates to utilize local time formatting for various datetime fields, improving user experience with timezone awareness.

templates/partials/projects/project_dashboard.html

@@ -81,7 +81,7 @@
                 {% for action in upcoming_actions %}
                     <div class="border border-gray-200 dark:border-gray-700 rounded-lg p-3">
                         <p class="font-medium text-gray-900 dark:text-white">{{ action.action_type }}</p>
-                        <p class="text-xs text-gray-500 dark:text-gray-400 mt-1">{{ action.scheduled_time.strftime('%Y-%m-%d %H:%M') }}</p>
+                        <p class="text-xs text-gray-500 dark:text-gray-400 mt-1">{{ action.scheduled_time|local_datetime }} {{ timezone_abbr() }}</p>
                         {% if action.description %}
                             <p class="text-xs text-gray-500 dark:text-gray-400 mt-1">{{ action.description }}</p>
                         {% endif %}