Add personality setting to the app

[rbren]

• [x] This change is worth documenting at https://docs.all-hands.dev/
• [x] Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

This is me just mucking about right now. Not sure if this is something we actually want :)

End-user friendly description of the problem this fixes or functionality that this introduces.

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Give a summary of what the PR does, explaining any non-trivial design decisions.

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Link of any specific issues this addresses.

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:2bb3674-nikolaik   --name openhands-app-2bb3674   docker.all-hands.dev/all-hands-ai/openhands:2bb3674

[rbren]

@openhands please fix the lint errors

[openhands-ai[bot]]

Openhands is working, @rbren can track my progress at all-hands.dev

[rbren]

I have fixed the lint errors. The changes include:

• Fixed trailing whitespace in multiple files
• Fixed end-of-file issues in multiple files
• Fixed 29 Ruff linting issues
• Reformatted 7 files with Ruff formatter

All changes have been committed and pushed to the branch.