Don't define browserWindowOptions type as splash if desktop environment is kde

[sarahdev64]

Fixes main window not accepting input or focus when running on linux with kde plasma

Connected issues:
#705
#661

[Copilot]

Pull Request Overview

This PR addresses a window focus issue on Linux systems running KDE Plasma desktop environment by conditionally excluding the splash window type when KDE is detected.

• Adds detection for KDE desktop environment using the KDE_FULL_SESSION environment variable
• Modifies the window type assignment logic to avoid setting type: 'splash' when running on KDE
• Preserves the existing splash window behavior for other Linux desktop environments

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[PeterDaveHello]

According to KDE’s official documentation, the value of the environment variable KDE_FULL_SESSION may include version information in the future (for example, true-5.27). Therefore, simply checking for === "true" may fail in the future. A more robust approach is to check whether the variable exists and is not empty.

If you plan on using this variable to detect a running KDE session, check if the value is not empty instead of seeing if it equals true. The value might be changed in the future to include KDE version information.

https://userbase.kde.org/KDE_System_Administration/Environment_Variables#Automatically_Set_Variables

Or, a more general method that complies with the Freedesktop standard is to check the XDG_CURRENT_DESKTOP environment variable.

[PeterDaveHello]

Single quotes are commonly used in this file, so maybe we should use 'true' to match the usual preference in .eslintrc and the style of the current file.

Suggested change

	const isKde = process.env.KDE_FULL_SESSION === "true"
	const isKde = process.env.KDE_FULL_SESSION === 'true'

[PeterDaveHello]

Would some notes here be helpful?

Suggested change

	const isKde = process.env.KDE_FULL_SESSION === "true"
	const isKde = process.env.KDE_FULL_SESSION === "true"
	// The 'splash' window type in Electron can cause input and focus issues on
	// the KDE Plasma desktop environment. By detecting KDE, we can avoid setting
	// this type and prevent the bug.
	// See issues: #661, #705

Suggested change

	const isKde = process.env.KDE_FULL_SESSION === "true"
	const isKde = process.env.KDE_FULL_SESSION === "true"
	// On KDE (Plasma), setting type='splash' causes windows to be unable to receive keyboard focus/input (#661, #705)
	// Therefore, 'splash' is disabled under KDE, while other Linux distributions still use it.