fix: interactive template pick crashes on PromptSession pointer

[ulises-jeremias]

Summary

• questionary.autocomplete(..., pointer=">") forwards pointer into prompt_toolkit.PromptSession, which rejects it (TypeError) and breaks uvx create-awesome-python-app when picking a template interactively
• Remove the unsupported kwarg (checkbox prompts keep pointer, which they support)
• Add a regression test that asserts autocomplete is not called with pointer

Test plan

• uv run --package create-awesome-python-app pytest packages/create-awesome-python-app/tests/test_interactive.py
• After 0.2.1 publish: uvx create-awesome-python-app@0.2.1 and confirm template autocomplete works

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