feat: refresh method in themeStore

[AntonioVentilii]

Motivation

We would like to have a refresh method in the themeStore. It is useful for example, if the theme is changed in the local storage and we need to "refresh" the store: for example, we have the case in OISY where we "set" the theme to SYSTEM, basically deleting the theme in local storage.

Changes

• Extract an util getCurrentTheme to get the current theme set in the store: this code is already inside initTheme, we just separate it to re-use it.
• Create sub-function setTheme inside initialTheme that is re-using the code of the select function.
• Reusing the sub-function above for the method refresh in combination with getCurrentTheme.
• A bit unrelated (but not that much): we use the initTheme function directly in the initialization of the store, instead of creating a function outside. I think it makes more sense since we do not want a static value when creating this store, but we want to capture the current theme.

Screenshots

Added a few tests for themeStore and initThemeStore.

[AntonioVentilii]

@peterpeterparker shall I break this in smaller PRs? If yes, any suggestion?

[peterpeterparker]

I don't understand your PR — it doesn't seem to implement the function we discussed. I might be missing something, but is it designed this way because some logic remains in OISY? Is that the idea?

To be clear, this is the feature logic I would have expected: #585

[AntonioVentilii]

@peterpeterparker Ah! I completely misunderstood then! Yes, the idea was to leave some logic there in OISY, but if that is not the case, for sure let's go with your PR

[AntonioVentilii]

As discussed offline, I will close this and continue with the correct implementation in :

• feat: option to reset theme to system settings #585