Conflicted transactions can accumulate in the wallet over time. These transactions clutter the transaction list and cannot be filtered out.
While the Overview page already hides conflicted transactions using TransactionFilterProxy::setShowInactive(false), the Transactions tab has no equivalent option, forcing users to scroll through potentially many obsolete entries.
This PR adds a "Hide conflicted" checkbox to the Transactions tab filter row, allowing users to toggle visibility of conflicted transactions. The implementation reuses the existing setShowInactive() function.
Before: Users must manually scroll past conflicted transactions with no filtering option.
After: A checkbox in the filter row lets users hide conflicted transactions with one click.
<img width="981" height="109" alt="image" src="https://github.com/user-attachments/assets/50596a8c-fb71-452c-bc8a-bc67efc23168" />