More flexible !from directive

[pomber]

Fix #439

Now we can mix !from with more code, annotations, or even more !from directives

```py
# !mark(2) bar
!from ./assets/test1.py

def hello():
    print("hello")

!from ./assets/test2.py
```

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
codehike.org	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 30, 2025 9:54am

[github-actions]

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