[App History] Not resetting history on long press

### Affected hardware version

Bangle 2

### Your firmware version

2v29.81

### The bug

I've been using the app for a while now, and when I long-press back to. the clock, it doesn't clear the history, which leads to random apps opening if that was the last app before long pressing away. I know that there is a specific time the user has to press to count as a long press, and works vice-versa, but I can't figure out how to clear the history at all via a long press. The `apphist.json` never clears the history when I do a long press, leading to unexpected apps opening when an app tries to go back to the clock (messages timeout, etc.)

### Author

@thyttan

Start by locating the JavaScript handling for app history and the apphist.json data on Bangle 2, then reproduce the long-press behavior with firmware 2v29.81. Done means a long press back to the clock clears the history and prevents a stale app from opening during later navigation.

Written by the indexing model from the issue text.