feat: Allow setting a price when adding an item to the wishlist

[JadElClemens]

Adds a "Price" field below name/URL field in the "add item" section.

This is a common issue for me when creating my wishlist - if I'm not adding a URL, I always have to add the item and then go back into the edit dialog to set a price. It's not often that I'll want to add an item with no price.

If a price is given, it takes precedence over the price fetched from getProductData. Open to input on that behavior.

Note - I've chosen to use table layout for positioning here as I see it in many other places in the source, otherwise I may have chosen ex. flexbox.

[JadElClemens]

One potential issue -

Has this result on too-narrow screens when field labels wrap to multiple lines

[cj13579]

I'm a fan of this change. getProductData is good, but if you're using a site it doesn't support, it doesn't work, or in my case I want to update the currency, this is a pain that could be solved by this!

[Wingysam]

I think this complicates the UI. Having a simple UI is very important to me because it makes the app accessible to people like relatives who might not be technically-minded. Having a big form in the way to add an item or even just too many things on screen can be overwhelming for some people.

Three fields isn't a lot of fields, the current two is the optimal amount to have, at least by default. This doesn't add a lot of complexity from a maintenance perspective, so I'm happy to merge it if you want to lock it behind an environment variable or a switch in the user's settings.

[cj13579]

Three fields isn't a lot of fields, the current two is the optimal amount to have, at least by default. This doesn't add a lot of complexity from a maintenance perspective, so I'm happy to merge it if you want to lock it behind an environment variable or a switch in the user's settings.

@JadElClemens - thoughts on putting this functionality behind an environment variable so people can turn it on/off as per their needs?

[JadElClemens]

No issue, just haven't had the time

[JadElClemens]

This is now gated behind the WISHLIST_PRICE_FIELD env variable, which is false by default.