✨ Refactor Welcome UI to adapt to that of Xcode 15

[austincondiff]

Description

Apple has recently released Xcode 15 which has a new Welcome window design. We should refactor our own welcome window UI to adopt this new design.

Additional Context

Notable changes:

• Much more subtle window shadow
• No inner window border (just the outer black border)
• Left panel has blurred material when using a dark appearance
• Icon glow when using a dark appearance (probably just a duplicated blurred image behind the primary un-blurred image)
• App title text is now bolded and "Welcome to" is omitted (just the app name)
• Actions now have a background
• Action labels are simpler with no secondary text
• Close button now always visible and uses a filled circle design
• "Show this window when Xcode launches" checkbox is now removed (presumed to be relocated to Settings)

Screenshots

New Xcode Welcome screen

Old Xcode Welcome screen

Current CodeEdit Welcome screen

[tom-ludwig]

I've got my superhero cape on and I'm ready to tackle this issue 🤣. (I'll try)

[luah5]

I've got my superhero cape on and I'm ready to tackle this issue 🤣. (I'll try)

@activcoding I already have a start on this (which I was working on before the settings search PR), how far along are you? Don't want to duplicate work!

[tom-ludwig]

Hey @luah5, I haven't even started yet. If you've already started doing this, @austincondiff can assign you to this issue. FYI Austin told me that the blur effect wasn't the default material and I implemented a somewhat custom blur effect once. If you don't get the effect right, please let me know and I'll try my best. Long story short: you are absolutely right, we must not do double work. wish you the best

[austincondiff]

@luah5 thanks for starting on this but I’d rather have you finish up your Settings search PR. It sounds like @activcoding has some ideas around that custom material. I’d like to see what he can come up with if that is okay.