fix: auto-fix findings from no-mistakes review

- Remove duplicate  import
- Fix  →  in create ticket
- Fix  →  in ticket detail
- Add note field to TicketUpdate schema and handle note-only updates in backend
- Update frontend submitNote() to use PATCH endpoint

app/services/ticket.py

@@ -275,6 +275,18 @@ async def update_ticket(
 
             ticket.status = new_status
 
+    # Handle standalone note (no status change)
+    note_only = data.get("note")
+    if note_only and (new_status is None or new_status == ticket.status):
+        await _log_status_change(
+            db,
+            ticket.id,
+            from_status=ticket.status,
+            to_status=ticket.status,
+            note=note_only,
+            user_id=user.id if user else None,
+        )
+
     # Update other fields
     for field in ("unit_id", "category_id", "priority", "reporter", "reported_via",
                   "description", "assigned_to", "eta", "cost", "parts_used"):