Is your feature request related to a problem? Please describe.
Chats are now stored in an sqlite3 ollama.db, and there's no way to clear chats.

Describe the solution you'd like
A "Clear Chats" button in the left sidebar or settings applet or both removes all chats from the database for the current user.

Describe alternatives you've considered
Manually deleting the database or records is a workaround.

Additional context
I'm running the ollama-webui built with provided docker-compose.yml from rev e0cbb00899f055ec5496c2c0b119b31f71ec5fa5 on the main branch.