simplified prop types for dash toolchain

[AnnMarieW]

Partially addresses #559

See more details in an alternate PR #686 which was closed in favor of this one.

This PR simplifies the Mantine style props

See also the DMC Style Prop docs

The style props include Mantine types such as MantineSize and MantineColor. These are complex types that include literals and string & {} in the type definition. Dash dash does not parse those correctly when creating Python types.

Background:

DMC extensively uses prop types that look like this:

size?: MantineSize | number;

The MantineSize type includes sizes defined in the theme object and string & {}, which enables literal type hints while still allowing arbitrary strings.

Dash cannot handle the string & {} pattern, so it is ignored. As a result, Dash generates the following Python type, which does not allow arbitrary strings:

typing.Optional[typing.Union[NumberType, Literal["xs"], Literal["sm"], Literal["md"], Literal["lg"], Literal["xl"]]] = None,

If it's changed to this:

size?: MantineSize | string | number;

it drops the MantineSize definitions.

 typing.Optional[typing.Union[str, NumberType]] = None,

This fixes the typing issue in Dash, but we lose the type hints for the Mantine literals.

Mantine Style Props - responsive styles:

The Mantine Style props also accept a dict with breakpoints for responsive styles. The type is defined as Partial<Record<MantineBreakpoint This is dropped by dash.

I tried defining the breakpoint dict like this: Record<string, string> but dash just drops this as well. For simplicity the breakpoint dicts are typed as object in this PR.