feat(resources): provide desktop file

[xarvex]

Summary

Provides a desktop file, and exposes it and the relevant icon for the Nix package.

Fixes: #415
Fixes: #422
Fixes: #847

Note that I cannot test pinning functionality as I do not use a desktop environment. Would appreciate help with testing that. Otherwise, I will create a virtual machine.

Tasks Completed

• Platforms Tested:
  • Windows x86
  • Windows ARM
  • macOS x86
  • macOS ARM
  • Linux x86 (NixOS)
  • Linux ARM
• Tested For:
  • Basic functionality
  • PyInstaller executable
  • Nix package building

[zierf]

Looks pretty good. I would say it now works as intended.

My system provides a KDE Wayland session.

nixpkgs: github:NixOS/nixpkgs/c80f6a7e10b39afcc1894e02ef785b1ad0b0d7e5?narHash=sha256-C7jVfohcGzdZRF6DO%2BybyG/sqpo1h6bZi9T56sxLy%2Bk%3D (2025-03-15 20:13:08)

$> nix-shell -p nix-info --run "nix-info -m"

 - system: `"x86_64-linux"`
 - host os: `Linux 6.13.6-xanmod1, NixOS, 25.05 (Warbler), 25.05.20250315.c80f6a7`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.24.12`
 - nixpkgs: `/nix/store/alzxn3hjisc84hrlv44x6hni48crww26-source`

---

I've temporarily switched my system flake's input to the commit in this PR.

tagstudio = {
  url = "github:TagStudioDev/TagStudio/77a1ac0d18b1ae9ffa8629f2cf92e352466bf941";
  inputs.nixpkgs.follows = "nixpkgs";
};

After that, I have a suitable entry in my Application Launcher.

The AppMenu/GlobalMenu is still there and now has the appropriate icon and application title.

I was also able to pin the window to my dock (just a floating KDE bar using built-in functionality).

(Application open)

(Application closed and still pinned)

---

If I don't install TagStudio via my system flake and run it directly from GitHub, it no longer has an icon or title (almost to be expected).

nix run github:TagStudioDev/TagStudio/77a1ac0d18b1ae9ffa8629f2cf92e352466bf941#tagstudio-jxl

I think this should be sufficient for a quick test for new users. I don't know if it would even be possible to create a desktop file when running directly, since the application isn't installed on the system.

[xarvex]

I initially thought about prefixing XDG_DATA_DIRS to provide the desktop file and icon in that way, however that would mean stripping the user's ability to customize. I went ahead and provided default values instead for the application name and icon.

This won't address things like pinning, as there is no desktop entry, but that makes sense to me when the application is not installed.