Fix: Ensure progress bar is cleared on download error

[echobt]

Description

This PR fixes an issue where the download progress bar would remain visible if the model download failed, corrupting the terminal output.

Changes

• Modified run_models in src/cli/commands.rs to separate the download call from the result handling.
• Ensures pb.finish_and_clear() is called before propagating any errors from the download operation.

Verification

• Verified by code analysis and local reproduction simulation (not included in PR) where early return prevented cleanup.
• Ran existing tests: cargo test passes.