When applying a category or transaction rule to all matching transactions at once, the action currently takes effect immediately with no confirmation step or way to undo it. This can result in a large number of transactions being miscategorized if the button is pressed accidentally.

It would be very helpful to either:
– Show a confirmation dialog before applying the change (e.g. “This will update 47 transactions. Are you sure?”), or
– Provide an undo option immediately after the bulk action is applied

This would reduce the risk of accidental bulk changes and make the feature safer to use, especially for users managing large transaction histories.