feat: ship the .desktop entry in this repo

The entry lived only in ~/.local/share/applications, hand-written and unversioned — the workspace root is not a git repo, so nothing written there survives a fresh clone. It now sits at the crate root, next to Cargo.toml and any unit file the crate ships, and `ccebuild install` deploys it.

Exec drops the hardcoded /home/lsgalante/.local/bin prefix for a bare binary name: ~/.local/bin leads the session PATH and the launcher spawns through `sh -c`, so the name resolves without baking a home directory into the file.

Co-Authored-By: Claude <[email protected]>

 cce-color-editor.desktop | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/cce-color-editor.desktop b/cce-color-editor.desktop
new file mode 100644
index 0000000..9fa48b6
--- /dev/null
+++ b/cce-color-editor.desktop
@@ -0,0 +1,7 @@
+[Desktop Entry]
+Type=Application
+Name=Color Editor
+Exec=cce-color-editor
+Icon=color-picker
+Terminal=false
+Categories=Utility;Graphics;