Is there a standardized length limit for these texts in the project? Maybe we should define constants for these. For now, I've capped them all at 4096 characters

LGTM except #33526 (comment)

Screenshots are necessary.

I noticed that the data field also doesn't have a length restriction. I'll add a length constraint to it as well. For this field, I think a limit of 65536 would be appropriate, although we can truncate the display when showing it.
The input data is generally UTF-8 encoded, so I will use UTF-8 character counting.
eg:

const (
	VariableDataMaxLength        = 65536
	VariableDescriptionMaxLength = 4096
)
if utf8.RuneCountInString(data) > VariableDataMaxLength {
	data = string([]rune(data)[:VariableDataMaxLength])
}

if utf8.RuneCountInString(description) > VariableDescriptionMaxLength {
	description = string([]rune(description)[:VariableDescriptionMaxLength])
}

Any other suggestions?

I think the description should be moved under value because it's optional. And it's better to have 2 rows at least.

I think the description should be moved under value because it's optional. And it's better to have 2 rows at least.

Does it refer only to the form, or does it also include the list? Perhaps it would be better to place the description in the list above.

Were all reviews addressed? If so, please resolve them.

All problems have been fixed.