HistoryCard.svelte routing regression (navigate() path + missing prefix)

[Polqt]

The new navigate() call in HistoryCard.svelte uses tickets/${item.ticketId} without a leading slash and no longer supports a configurable base path (previously ticketUrlPrefix + ticketPk). This may cause broken navigation depending on the router’s expectations.

What needs to be done:

1. Restore support for a configurable ticket route prefix.
2. Ensure the generated URL matches the app’s actual ticket detail route.
3. Add a leading slash if required by the router.