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 and `ccebuild install` deploys it.

Imported verbatim. Alone among the ten entries this one already used a bare Exec and a relative Icon name, so it is the precedent the other nine were corrected against rather than a file needing correction itself.

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

 cce-preview.desktop | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/cce-preview.desktop b/cce-preview.desktop
new file mode 100644
index 0000000..4301c22
--- /dev/null
+++ b/cce-preview.desktop
@@ -0,0 +1,11 @@
+[Desktop Entry]
+Type=Application
+Name=Preview
+GenericName=Document Viewer
+Comment=View PDFs and images
+Exec=cce-preview %f
+Icon=cce-preview
+Terminal=false
+Categories=Graphics;Viewer;
+MimeType=application/pdf;image/png;image/jpeg;image/gif;image/webp;image/bmp;image/tiff;image/vnd.microsoft.icon;
+NoDisplay=false