05/07 Phase 3: fixed tenant's appoinment page error

app/tenant/appointments/routes.py

@@ -228,4 +228,4 @@ def _user_db_id():
         uid_str = current_user.get_id()
         return int(uid_str.split(":")[1]) if uid_str and ":" in uid_str else None
     except Exception:
-        return None
+        return None

templates/tenant/appointments/index.html

@@ -4,12 +4,12 @@
 <div class="d-flex justify-content-between align-items-center mb-3">
   <h4 class="fw-bold mb-0"><i class="bi bi-calendar3 me-2"></i>Appointments</h4>
   <div class="d-flex align-items-center gap-2">
-    <a href="{{ url_for('appointments.index', date=(view_date - timedelta(days=1)).isoformat()) }}"
+    <a href="{{ url_for('appointments.index', date=prev_date.isoformat()) }}"
        class="btn btn-outline-secondary btn-sm">‹</a>
     <input type="date" class="form-control form-control-sm" value="{{ view_date.isoformat() }}"
            onchange="window.location='{{ url_for('appointments.index') }}?date='+this.value"
            style="width:150px;">
-    <a href="{{ url_for('appointments.index', date=(view_date + timedelta(days=1)).isoformat()) }}"
+    <a href="{{ url_for('appointments.index', date=next_date.isoformat()) }}"
        class="btn btn-outline-secondary btn-sm">›</a>
     <a href="{{ url_for('appointments.create') }}" class="btn btn-primary btn-sm ms-2">+ New</a>
   </div>
@@ -48,9 +48,4 @@
     </table>
   </div>
 </div>
-{% endblock %}
-{% block scripts %}
-<script>
-// Import timedelta not available in Jinja — use JS for date nav
-</script>
 {% endblock %}