[Enhancement]: Implement a Fluent Design 2 (WinUI3) GUI.

[RokeJulianLockhart]

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Feature request

Which Nextcloud Version are you currently using:

I believe that I am unable to access this information.

Is your feature request related to a problem? Please describe.

WinUI versions 2 and 3 are the sole currently Microsoft-endorsed GUI toolkits for Windows applications. This matters, because like how on AOSP, any application targeting API Level >31 is expected, by the userbase, to adhere to Material 3 design guidelines (the application style standard) and support Material You (the user-defined colouration customisation standard), Windows 11 users expect (Version > 1 of) WinUI.

Currently, NextCloud does not do so:

Describe the solution you'd like

At least, support the FluentWinUI3 QQuickStyle on Windows 11.

Describe alternatives you've considered

Somehow implement the Fluent Design application style guidelines without doing so. This seems like a lot more work for no gain, though.

Additional context

OneDrive has done so:

Alternative examples of well-designed FD applications are:

1. simon-knuth/scanner:

   

2. bloxstraplabs/bloxstrap:

   

[mgallien]

we currently are working on the switch to a Fluent Windows style (native Windows 11 style from Microsoft).
see #7416
any bigger redesign of the settings dialog would take longer

[RokeJulianLockhart]

#7738 (comment)

@mgallien, that is a significant improvement. If Qt is actually able to provide a compliant application style, then perhaps that is the solution. I'm rather surprised that they've bothered to.