Here is a conventional commit message summarizing the refactoring work:

```
feat: Refactor calendar feature into blueprint

- Moved calendar logic from `features/calendar.py` and `app.py` into a new blueprint at `routes/calendar.py`.
- Removed the `Calendar` class and refactored logic into helper functions within the blueprint module for better organization and readability.
- Eliminated the `pandas` dependency for date range generation, using standard `datetime` operations instead.
- Resolved circular import issues between `db.py`, `extensions.py`, and `routes/calendar.py` by adjusting import locations.
- Corrected `url_for` calls in templates (`calendar.html`, `partials/people_link.html`) to reference the new blueprint endpoint (`calendar.get_calendar`).
- Fixed an `AttributeError` related to HTMX request checking in the calendar route.
- Corrected `AttributeError` related to `.date()` calls on `datetime.date` objects in view processing functions.
- Updated `templates/changelog/changelog.html` to document the refactoring and associated fixes.
```

templates/workout.html

@@ -24,7 +24,7 @@
                         d="m1 9 4-4-4-4" />
                 </svg>
                 {% set hx_current_url = request.headers.get('HX-Current-URL') %}
-                <a hx-get="{{ hx_current_url if hx_current_url else url_for('get_calendar', person_id=person_id) }}"
+                <a hx-get="{{ hx_current_url if hx_current_url else url_for('calendar.get_calendar', person_id=person_id) }}"
                     hx-push-url="true" hx-target="#container"
                     class="ms-1 text-sm font-medium text-gray-700 hover:text-blue-600 md:ms-2 dark:text-gray-400 dark:hover:text-white cursor-pointer">{{person_name}}</a>
             </div>