remove unused case import from main views

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: JacobCoffee

cabotage/server/main/views.py

@@ -1,6 +1,6 @@
 from flask import render_template, Blueprint
 from flask_login import current_user
-from sqlalchemy import case, func
+from sqlalchemy import func
 from sqlalchemy.orm import joinedload
 
 from cabotage.server import db