Revert "feat(settings): add auto-launch on system startup feature"

This reverts commit ba336fc416.

Reason: Found issues that need to be addressed before reintroducing
the auto-launch feature. Will reimplement with fixes.

src-tauri/Cargo.toml

@@ -34,7 +34,6 @@ tauri-plugin-updater = "2"
 tauri-plugin-dialog = "2"
 tauri-plugin-store = "2"
 tauri-plugin-deep-link = "2"
-auto-launch = "0.5"
 dirs = "5.0"
 toml = "0.8"
 toml_edit = "0.22"