feat: background color APIs

[amrbashir]

closes #10519
closes #1564

needs: tauri-apps/tao#995

[github-actions]

Package Changes Through bf3c384

There are 9 changes which include tauri-utils with minor, tauri with minor, @tauri-apps/api with minor, tauri-bundler with minor, tauri-cli with minor, @tauri-apps/cli with minor, tauri-runtime-wry with minor, tauri-macros with patch, tauri-runtime with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/api	2.0.3	2.1.0
tauri-utils	2.0.2	2.1.0
tauri-bundler	2.0.4	2.1.0
tauri-runtime	2.1.1	2.2.0
tauri-runtime-wry	2.1.2	2.2.0
tauri-codegen	2.0.2	2.0.3
tauri-macros	2.0.2	2.0.3
tauri-plugin	2.0.2	2.0.3
tauri-build	2.0.2	2.0.3
tauri	2.0.6	2.1.0
@tauri-apps/cli	2.0.4	2.1.0
tauri-cli	2.0.4	2.1.0

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[dionysuzx]

is it possible to set it different on dark vs light mode? @amrbashir (on backend, so like when it starts up, fetching first from system)

[amrbashir]

you'd have to get the theme first before creating the window and then create the window with the color you want through Rust not in the config.

[dionysuzx]

you'd have to get the theme first before creating the window and then create the window with the color you want through Rust not in the config.

this won't work on macOS or iOS right? out of curiosity what is the blocker or path to getting it implemented for those systems? cc @amrbashir (thank you for your work on this btw!)

[amrbashir]

I don't have a macOS so I can't test anything but there is https://developer.apple.com/documentation/webkit/wkwebview/3850574-underpagebackgroundcolor?language=objc that we could use but only supported on macOS 12+ and iOS 15+, so we need an alternative for older systems versions. This just needs to be implemented in wry repo (and tao if needed) and should automatically be supported in tauri afterwards.