rx.foreach crashes on hashing the render function's code when the render function is a functools.partial

[gmos]

Describe the bug
rx.foreach() crashes on hashing the render function's code when the render function is a functools.partial function.

To Reproduce
Steps to reproduce the behavior:

_display_primary_color = partial(_display_color, "accent_color")

def primary_color_picker() -> rx.Component:
    return rx.flex(
        rx.foreach(ColorPickerState.primary_color_options, _display_primary_color),
        **PICKER_PARS,
    )

Expected behavior
Expected the partial function to just work.

Screenshots
N/A

Specifics (please complete the following information):

• Python Version: 3.13
• Reflex Version: 0.6.7
• OS: Ubuntu 24.04
• Browser (Optional): Chrome

Additional context
In method _render of class Foreach in file foreach.py the props["index_var_name"] can be derived from a hash of the render function's byte code. However, functools.partial() functions do not have bytecode.

Suggested fix
The following code fixes the issue. Since the bytecode will be the same for all partial functions derived from the same base function, the 'frozen' parameters are made part of the hash by using the repr.

            ...
            code_hash = (
                hash(
                    getattr(self.render_fn, "__code__", None) or
                    # Fall back to the repr of the function if the code object is not available.
                    # This will handle functools.partial() functions nicely, including the fixed paramater values.
                    repr(self.render_fn)
                )
                .to_bytes(
                    length=8,
                    byteorder="big",
                    signed=True,
                )
                .hex()
            )
            ...

[linear]

ENG-4357 rx.foreach crashes on hashing the render function's code when the render function is a functools.partial