fix(cli): add data loss warning to --force flag in pr command

Fixes bounty issue #1409

The --force flag help text now warns users that uncommitted changes will be
lost when using this flag, as it triggers a forceful git checkout.

Author: factorydroid

cortex-cli/src/pr_cmd.rs

@@ -63,7 +63,7 @@ pub struct PrCli {
     #[arg(short, long)]
     pub path: Option<PathBuf>,
 
-    /// Force checkout even if there are uncommitted changes.
+    /// Force checkout even if there are uncommitted changes (WARNING: uncommitted changes will be lost).
     #[arg(short, long)]
     pub force: bool,