_colorize: LiveProfiler.no_colors() sets int and Literal fields to ""

[Tony123-tech]

Lib/_colorize.py has a type-contract violation in
ThemeSection.no_colors(). It assumes every field is a str ANSI
escape and sets them all to "":

@classmethod
def no_colors(cls) -> Self:
    color_state: dict[str, str] = {}
    for color_name in cls.__dataclass_fields__:
        color_state[color_name] = ""
    return cls(**color_state)

But LiveProfiler (line 261) has int fields (CursesColors.*) and a
Literal["dark", "light"] field (background_style). Overriding them
to "" breaks the type contract.

Reproduction:

from _colorize import LiveProfiler, theme_no_color
print(repr(LiveProfiler.no_colors().title_fg))          # ''
print(repr(LiveProfiler.no_colors().background_style))  # ''
print(repr(theme_no_color.live_profiler.title_fg))      # ''
print(repr(theme_no_color.live_profiler.background_style))  # ''

Expected: title_fg is an int (CursesColors.*), background_style is
'dark' or 'light'.

Compare with the default theme, which is correct:

from _colorize import default_theme
print(repr(default_theme.live_profiler.title_fg))          # 6
print(repr(default_theme.live_profiler.background_style))  # 'dark'

Impact: any consumer of theme_no_color.live_profiler that passes
title_fg to curses.init_pair or curses.color_pair will get
TypeError: an integer is required, or a silently wrong color.

Possible fixes:

1. Override LiveProfiler.no_colors() to set int fields to
   CursesColors.DEFAULT (-1) and leave background_style at 'dark'.
2. Make ThemeSection.no_colors() aware of field types.
3. Add a parameter to no_colors() specifying the "no color" value.

I'd like to submit a PR once a direction is agreed on.

[StanFromIreland]

This is a private function, and from what I can tell this isn’t reproducible from any public API (so we aren’t affected). As such, I’m going to close this for now.