Explorer: some pages are doing twice the work

### Describe the problem you discovered

Example page: https://testnet.archethic.net/explorer/transaction/000004ED230762C7E08D4438221AC1850409F061BC552DBD8B25A678FEEA7FD235C4

when reloading this page, the handle_params is called twice, resulting in 2 `search_transaction`.

There is probably the same behaviour on multiple pages.

### Describe the solution you'd like

Reloading the page should trigger `search_transaction` only once.

### Epic

#146

Start with the Explorer transaction page shown in the example URL and trace the handle_params call that leads to search_transaction. Check why reloading invokes the handler twice, then verify that a reload produces only one search_transaction call and consider whether the same behavior affects other Explorer pages.

Written by the indexing model from the issue text.