Implement model version comparison in manifest #43
Description
Description
src-tauri/src/transcription/manifest.rs:387 has a TODO to implement version comparison for model updates.
Currently update_available is hardcoded to false. Should compare installed model version against manifest version to detect available updates.
Acceptance Criteria
- Compare installed model version with manifest version
- Set
update_available: truewhen newer version exists - Handle missing version info gracefully