fix(tests): restore packing panel inline header + update tests for ui changes

- PackingListPanel accepts inlineHeader prop (default true) to keep its
  legacy title and inline import button; ListsContainer passes
  inlineHeader={false} since the toolbar now owns those controls
- ReservationModal tests look for the renamed 'Car' button (was 'Rental Car')
- Budget total-budget test asserts against the split integer/decimal
  spans that replaced the single text node

client/src/pages/TripPlannerPage.tsx

@@ -129,7 +129,7 @@ function ListsContainer({ tripId, packingItems, todoItems }: { tripId: number; p
         </div>
       </div>
       <div style={{ padding: '16px 28px 0' }} className="max-md:!px-4">
-        {subTab === 'packing' && <PackingListPanel tripId={tripId} items={packingItems} openImportSignal={importPackingSignal} />}
+        {subTab === 'packing' && <PackingListPanel tripId={tripId} items={packingItems} openImportSignal={importPackingSignal} inlineHeader={false} />}
         {subTab === 'todo' && <TodoListPanel tripId={tripId} items={todoItems} addItemSignal={addTodoSignal} />}
       </div>
     </div>