Nix desktop package lacks launcher assets

[jerome-benoit]

Description

The Electron-based Nix desktop package installs no desktop entry or hicolor icons, so OpenCode does not appear in Linux application launchers. This regressed after the Electron migration; electron-builder --dir does not generate target-specific launcher assets. Related historical issue: #8971.

OpenCode version

1.18.2 / dev

Steps to reproduce

1. Run nix build .#opencode-desktop.
2. Inspect result/share/applications and result/share/icons.
3. Observe that the launcher and application icons are absent.

Operating System

NixOS unstable