Upgrade `tauri-runtime` to `gtk4-rs`

[tweidinger]

We need to upgrade from gtk to gtk4-rs to migrate a unsoundness issue found in glib < 0.2.
Please claim this issue if you want to support or work on this and keep in mind this is a prioritized issue and we try to migrate as soon as possible. If the issue is already assigned to someone you can either reach out with comments or questions reach out for collaboration to the assigned person.

This transition includes:

• Upgrading gtk to gtk4-rs and handling all errors caused by the dependency change
• Handle all changes in a backwards compatible way if possible
  • Raise awareness to the working group if breaking changes are required
• Document migration errors that may be issues in the future or which were complicated to handle
• Reach out to the working group (alternatively @tweidinger first) if blockers or upstream issues are hit

[mdabir1203]

I would like to take on this.My first question would be : Where in the codebase shall I start looking?

[tweidinger]

tauri/crates/tauri-runtime/Cargo.toml

Line 43 in 741e44b

gtk = { version = "0.18", features = ["v3_24"] }

Is the gtk reference we need to port to the new major version.

[rmakestrash-jpg]

I've submitted PR #14684 which addresses this issue along with #12561 and #12563.

The PR migrates the Linux backend from GTK3/WebKitGTK 4.x to GTK4/WebKitGTK 6.0, including updates to window resizing logic and monitor detection methods.

Happy to address any feedback.

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