2026/10/15 Unified the behavior of the "Back" button on the learner screen

In the learner screen, a "←" button is now displayed on screens other than those opened from the bottom menu.
Pressing "←" will return you to the previous screen.
When you open a detail from a list and go back, you will be returned to your original position in the list.
The same applies when using the Browser's back operation.