feat: add task deletion for all users

app/templates/tasks/task_form.html

@@ -7,6 +7,9 @@
     <h2>{% if mode == 'edit' %}Änderungen für {{ task.title }}{% else %}Neue Aufgabe anlegen{% endif %}</h2>
     <form method="post" class="form-grid form-grid--two">
       {{ form.hidden_tag() }}
+      {% if mode == 'edit' %}
+        <input type="hidden" name="next" value="{{ next_url }}">
+      {% endif %}
 
       <div class="field field--full">
         {{ form.title.label }}
@@ -57,8 +60,18 @@
       <div class="form-actions field--full">
         {{ form.submit(class_='button') }}
         <a class="button button--ghost" href="{{ url_for('tasks.all_tasks') }}">Abbrechen</a>
+        {% if mode == 'edit' %}
+          <button
+            type="submit"
+            class="button button--ghost button--danger"
+            formmethod="post"
+            formaction="{{ url_for('tasks.delete', task_id=task.id) }}"
+            onclick="return confirm('Diese Aufgabe wirklich löschen?');"
+          >
+            Aufgabe löschen
+          </button>
+        {% endif %}
       </div>
     </form>
   </section>
 {% endblock %}
-