chore: use libcosmic's freedesktop-desktop-entry

Cargo.lock

@@ -1308,7 +1308,6 @@ dependencies = [
  "cosmic-settings-daemon-config",
  "cosmic-settings-subscriptions",
  "dirs 6.0.0",
- "freedesktop_entry_parser",
  "futures-util",
  "greetd_ipc",
  "i18n-embed",
@@ -2253,16 +2252,6 @@ dependencies = [
  "xdg 2.5.2",
 ]
 
-[[package]]
-name = "freedesktop_entry_parser"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db9c27b72f19a99a895f8ca89e2d26e4ef31013376e56fdafef697627306c3e4"
-dependencies = [
- "nom",
- "thiserror 1.0.69",
-]
-
 [[package]]
 name = "fsevent-sys"
 version = "4.1.0"