Atmos error output is unreadable on terminal with white background

### Describe the Bug

Atmos outputs colored text by default. However, it currently assumes the terminal has a dark background, and outputs white error text. This is illegible on a standard "light mode" terminal with a white background. Atmos should default to showing output in colors that contrast with the background, and not use colored output (just use default terminal foreground and background colors) if it cannot determine the background color.

Colored text is nice, but legibility is more important. Users should not have to take any action for the output of Atmos to be legible.

### Expected Behavior

Any output text, colored or not, should, by default, meet the [WCAG minimum contrast criterion](https://www.w3.org/TR/WCAG22/#contrast-minimum), unless users specifically configure Atmos otherwise.

This includes supporting users who use light mode some of the time (e.g. daytime) and dark mode at other times (e.g. nighttime).

### Steps to Reproduce

1. Use a terminal that supports color. I use `TERM=xterm-256color` but you can probably use other color modes, including full color.
2. Set the terminal to dark text on a white background.
3. Run `atmos error`
4. Try to read the error message

### Screenshots


The last line of text, "the flag '--component' is passed, but the component is not defin..." is only legible at all because the background is tinted. If it were white, it would be completely illegible.

### Environment

Atmos 1.169.0

### Additional Context

## Web Content Accessibility Guidelines (WCAG) 2.2
- [WCAG minimum contrast criterion](https://www.w3.org/TR/WCAG22/#contrast-minimum)
- [Understanding Contrast (Minimum)](https://www.w3.org/WAI/WCAG22/Understanding/contrast-minimum.html)
- [How to Meet Contrast (Minimum)](https://www.w3.org/WAI/WCAG22/quickref/#contrast-minimum)

Start at the `atmos error` CLI entry point and trace how colored output is selected. Reproduce the output on light and dark terminals, then verify that it meets the WCAG contrast requirement or falls back to terminal defaults when the background cannot be determined.

Written by the indexing model from the issue text.