feat(templates): add auto-run toggle and quick start templates in session

[JiahaoZhu11]

Summary

• Add autoRun toggle to templates allowing users to choose whether templates automatically start execution or just populate the prompt for review
• Display quick start templates in the session empty state for faster workflow access
• Rename runTemplate → applyTemplate to better reflect the new behavior

Test plan

• Create a new template with auto-run ON → verify it creates session and runs immediately
• Create a new template with auto-run OFF → verify it creates session but only populates prompt
• Open a session with no messages → verify quick start templates appear
• Verify existing templates default to auto-run enabled

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

[JiahaoZhu11]

@benjaminshafii Hi Ben! I noticed you've renamed "template" to "command" – that's a significant change!

I've already resolved merge conflicts with dev twice for this PR, but with the latest changes touching the same areas, there are now substantial conflicts again. Before I invest more time in resolving them, I'd love to get your thoughts on whether this feature direction aligns with what you want for the project.

My use case: I wanted a template (now "command") that can organize a folder for me, with the ability to specify which folder to organize. That's the core motivation behind this PR.

Would you be open to this feature, or would you prefer a different approach? Happy to discuss or adjust the implementation based on your feedback!